The parasympathetic nervous system causes a ________ in heart rate and a ________ in contractility
Answers
The parasympathetic nervous system causes a decrease in heart rate (bradycardia) and a decrease in contractility of the heart.
The parasympathetic nervous system, also known as the "rest and digest" system, is responsible for regulating various bodily functions during periods of relaxation and rest. When the parasympathetic system is activated, it exerts inhibitory effects on the heart, resulting in a decrease in heart rate (bradycardia) and a decrease in contractility.
The main neurotransmitter involved in the parasympathetic regulation of the heart is acetylcholine. Parasympathetic preganglionic fibers release acetylcholine, which binds to muscarinic receptors located on the cells of the heart's conducting system, specifically in the sinoatrial (SA) node and atrioventricular (AV) node.
Activation of muscarinic receptors in the SA node slows down the generation of electrical impulses, which in turn decreases the heart rate. This is achieved by increasing the permeability of the SA node cells to potassium ions, hyperpolarizing the cell membrane and reducing its ability to depolarize and initiate action potentials.
Furthermore, the parasympathetic activation leads to the release of acetylcholine onto muscarinic receptors in the AV node, which slows down the conduction of electrical impulses from the atria to the ventricles. This delay allows for proper coordination of atrial and ventricular contractions, resulting in a decrease in contractility of the heart.
Overall, the parasympathetic nervous system's influence on the heart is to decrease heart rate and contractility, promoting a state of relaxation and conservation of energy.
To know more about parasympathetic nervous system follow the link:
https://brainly.com/question/13014355
#SPJ4
Related Questions
What characteristics are important for health science professionals?
O empathy
O diligence
O cultural awareness
O all of the above
Answers
Answer:
A. Empathy
Explanation:
i hope it helps:)
Which pelagic zone begins at 1000 meters and is pitch black, has bioluminescent creatures, but no plant life
Answers
which individual would be considered the fittest? group of answer choices individual that has the longest canine teeth within the group individual that has the greatest number of offspring individual that has the greatest number of breeding opportunities individual that controls the largest territory individual that has the best camouflage to avoid predators
Answers
The individual that has the greatest number of offspring would be considered the fittest. In the context of evolution and natural selection, fitness refers to an individual's ability to pass on its genetic traits to future generations.
In evolutionary terms, fitness is a measure of an organism's reproductive success and its ability to pass on its genes to future generations. Fitness is determined by how well an individual is adapted to its environment and how successful it is in producing viable offspring.
The individual that has the greatest number of offspring is considered the fittest because it has achieved the highest level of reproductive success. By producing a large number of offspring, this individual increases the chances that its genes will be represented in future generations. These offspring inherit the traits and characteristics that helped their parent survive and reproduce, thereby increasing the overall fitness of the population.
While other factors such as long canine teeth, territorial control, camouflage, and breeding opportunities may contribute to an individual's survival and reproductive success in specific contexts, the ultimate measure of fitness is the number of offspring an individual produces. It is through successful reproduction and the passing on of genetic material that organisms ensure their genetic legacy in the population over time.
To know more about natural selection, follow the link:
https://brainly.com/question/31054297
#SPJ4
Consider the oligopeptide: ALKMPEYISTDQSNWHHR If treated with pepsin, how many peptide fragment(s) would be present? Enter your answer as a whole number. If no cleavage takes place, enter a " 1 " to indicate the peptide remained intact.
Answers
When treated with pepsin, the oligopeptide ALKMPEYISTDQSNWHHR would yield two peptide fragments. Cleavage occurs between the phenylalanine (F) and leucine (L) residues, resulting in fragments ALKMPEYISTDQSNW and HHR.
Pepsin specifically cleaves peptide bonds following aromatic amino acids (phenylalanine, tryptophan, and tyrosine) and certain amino acids like leucine, methionine, and glutamic acid. Analyzing the given oligopeptide, we can identify potential cleavage sites. Pepsin would cleave after the phenylalanine (F) residue, resulting in two fragments: ALKMPEYISTDQSNWHHR.
Therefore, the answer is "2" peptide fragments. The cleavage takes place between the phenylalanine (F) and the following leucine (L) residues. This would yield two separate peptide fragments: ALKMPEYISTDQSNW and HHR. The first fragment ends with the last amino acid cleaved, while the second fragment starts from the cleavage site and continues until the end of the oligopeptide.
To learn more about pepsin follow the link
https://brainly.com/question/30049883
#SPJ4
The effectiveness of certain anesthetics depends in part on their lipid solubility. Why is this?
Answers
It has been hypothesized that anesthetics interact with a hydrophobic region on the cell membrane, either the lipid bilayer itself or the hydrophobic domain of a membrane protein, because anesthetic efficacy is strongly associated to lipid solubility.
Lipid-soluble compounds can easily pass through the plasma membrane thanks to the hydrophobic core of the phospholipid bilayer. The essential part of the plasma membrane is the phospholipid bilayer. The lipid bilayer serves as a barrier to the entry and exit of different chemicals and ions from the cell. Allowing specific chemicals to enter and leave cells on a selective basis is one of the plasma membrane's key roles. A plasma membrane's phospholipid layer is made up of two layers of phosphate and lipid molecules. End of the hydrophobic lipid Lipid bilayer refers to the plasma membrane's orientation of the hydrophilic phosphate ends facing outward and the phospholipid facing inward.
To know more about anesthetics
https://brainly.com/question/13451466
#SPJ4
describe a chemical reaction
Answers
Answer:
The chemical reactions is a process in which one or more substances, the reactants, are converted to one or more different substances, the products.
Explanation:
.
Answer:
A chemical reaction is a process in which the reactants are converted into one or more different substances. A chemical reaction occurs when certain bonds between the atoms are formed or broken. The substances that are formed at the end of the reaction are called products.
Hope this helps! :)
What are living things describe their characteristics
Answers
Answer:
movement
growth and development.
response to stimuli.
reproduction.
use of energy.
cellular structure.
Explanation:
Answer:
They have some sort of ventilation, they can reproduce, they can evolve and grow up, they can eat whatever's considered food
Explanation:
What are two simple machines or devices that remind you of different mechanisms within the human body’s skeletal and articular systems? Mention the part of the human body, what machine or other device it reminds you of, and how the body part and machine or device are similar. You might take a particular joint and relate it to a type of simple machine. The action that a muscle produces when it pulls on a bone, for example, is similar to a simple machine called a lever.
Answers
The human body's skeletal and articular systems can be compared to two simple machines: levers and pulleys. The action of muscles pulling on bones is similar to a lever, while the function of tendons and ligaments can be likened to pulleys.
One example of a simple machine that resembles the human body's skeletal system is a lever. When muscles pull on bones, they act as forces that create movement around joints. This action is similar to how a lever works, where an applied force causes a rotational movement around a fixed point. For instance, the movement of the forearm when bending the elbow is analogous to a lever system.
Another example is the pulley, which can be compared to the function of tendons and ligaments within the articular system. Tendons and ligaments connect muscles to bones and bones to other bones, respectively, providing stability, support, and facilitating movement. Similar to how a pulley changes the direction or magnitude of a force, tendons and ligaments transmit forces from muscles to bones, allowing efficient and controlled movement.
Learn more about tendons here:
https://brainly.com/question/30632664
#SPJ11
Why is spider not classified as an insect ?
Answers
Solution:
Both insects and arachnids are arthropods. However, in the morphology of an insect, there are 6 legs. While in the morphology of an arachnid there are 8 legs. Also, arachnids do not have antennae, their head is not differentiated from the body but is typically divided into two main regions called the cephalothorax (prosoma) and the abdomen (opisthosoma). Spiders belong to the arachnids, therefore a spider is different from an insect. Therefore, a spider cannot be classified as an insect.
Fossil evidence indicates that horses have gradually increased in size over geologic
time. Which of the following terms best describes this?
a artificial selection
b directional selection
c stabilizing selection
d disruptive selection
e sexual selection
Answers
According to the given statement the following terms best describes this Directional selection.
The correct option is B.
What is an example of fossil evidence?Examples includes fossilized bones, shells, exoskeletons, animal or microbe imprints in stone, orangish objects, hair, petrified timber, oil, coal, and DNA traces. The fossil record is indeed the collection of all fossils.
What characteristics define fossil evidence?Fossils are the remains of once-living things.Rock is used to create fossils because it can fill in or replace an organism's body or imprint.Sedimentary rock, as opposed to igneous or metamorphic rock, is often the material used to create fossils.To know more about Fossil visit:
https://brainly.com/question/6867325
#SPJ13
how to make snow ice cream with sweetened condensed milk
Answers
Answer:
Ingredient
8-12 cups fresh, clean snow1 tsp vanilla extract300 mls sweetened condensed milk 10 oz1. Where did Rosalind Franklin go to college and what subject did she study? ____________________________________________________________________________
2. In 1951, Franklin was offered a 3 year research scholarship where? ____________________________________________________________________________
3. Franklin worked with Raymond Gosling and was able to get photos of DNA fibers. What did she conclude from these photos (two things)? ________________________________________________________________________________________________________________________________________________________
Go to the top of the website and click on James Watson's name…..
4. What book did James Watson write and when was is published?_______________________________________________________________________________________________________________________________________________
Answers
Answer:
The answers are below!
Explanation:
1. Chemistry
2. King College In London
3. In the photos she took she revealed different shapes that are in the DNA. And also two chains of nucleotide pairs that are living things.
4. He wrote " The Double Helix".
Explain what is meant by competitive exclusion principle
Why do species occur where they do?
Citing examples, distinguish between density dependent and density independent factors
that influence population size?
Answers
Competitive exclusion principle: Competitive exclusion principle refers to the inevitable elimination of one of the two different species competing for the same resources in the same location or ecosystem. If two species have the exact same niche, or the specific ecological role they play in the environment
only one of the species will remain in the long run. This is due to the fact that both species will compete for the same limited resources, resulting in one species eventually outcompeting the other.
Species occur where they do due to a variety of factors such as abiotic factors like temperature, rainfall, and humidity, and biotic factors like predation, parasitism, competition, and mutualism. However, the distribution of organisms may not always be random.
The competitive exclusion principle and resource partitioning are two reasons why species may not always have an even distribution.
Density dependent factors and density independent factors are the two types of limiting factors that regulate population size. Density-dependent limiting factors are those that have a greater impact as the population size increases, such as predation, parasitism, and competition. On the other hand, density-independent limiting factors, like natural disasters or human activities, have a greater impact on population size regardless of population density.
Example: In a small pond, only one species of tadpole was observed in the water because it required the same type of food and was a better swimmer than other tadpoles.
Thus, it outcompeted the other species, and the competitive exclusion principle was observed.
Another example of a density-dependent limiting factor would be food. If there is a limited amount of food available in a certain environment, the population of organisms living there may not be able to grow beyond a certain point due to a lack of resources.
To know more about independent viist;
brainly.com/question/27765350
#SPJ11
Name: Plants with no roots but have stems and leaves
Correct answer will be marked as brainliest
Answers
Answer:
Bryophyta or Mosses.
Explanation:
The plants with no roots but have steams and leaves are Bryophyta.
Question 8 of 10
Which of the following shows the importance of incoming solar energy for life
on Earth?
OA. Electrons
OB. Food chains
OC. Enzymes
D. Rock cycles
Answers
The correct answer is OB. Food chains.
What is a Incoming solar energy?Incoming solar energy is essential for life on Earth as it drives photosynthesis, which is the process by which plants and some other organisms convert sunlight into chemical energy in the form of organic compounds, such as glucose.
Without incoming solar energy, the production of organic compounds through photosynthesis would not be possible, leading to the collapse of the food chain and ultimately the extinction of life on Earth.
Electrons, enzymes, and rock cycles are all important for various processes on Earth, but they are not as directly tied to the production of organic compounds through photosynthesis as incoming solar energy is.
Learn more about incoming solar energy here : brainly.com/question/8586371
#SPJ1
Place the structures involved in cerebrospinal fluid (CSF) circulation in order from the initial production of CSF to when the CSF is absorbed into venous circulation.
- arachnoid villi - median and lateral apertures - choroid plexus - ventricles - dural sinuses - subarachnoid space
Answers
The structures involved in cerebrospinal fluid (CSF) circulation in order from the initial production of CSF to when the CSF is absorbed into venous circulation are choroid plexus - ventricles - arachnoid villi - subarachnoid space - median and lateral apertures - dural sinuses.
Cerebrospinal fluid (CSF) is a transparent, colorless liquid that surrounds the brain and spinal cord. Its function is to supply nutrients and remove metabolic waste products from the central nervous system (CNS).
The initial production of CSF occurs in the brain's ventricles, specifically in the choroid plexus. Then, the CSF flows through the ventricles before entering the subarachnoid space.
The absorption of CSF into venous circulation takes place via arachnoid villi, followed by its drainage into the dural sinuses, and finally returned to the circulatory system.
Hence, the proper sequence of structures involved in CSF circulation is as follows: choroid plexus - ventricles - subarachnoid space - arachnoid villi - dural sinuses - median and lateral apertures.
Overall, CSF plays a critical role in maintaining the proper functioning of the CNS.
Learn more about cerebrospinal fluid.
https://brainly.com/question/30666353
#SPJ11
How might photosynthesis be affected if the spongy mesophyll cells were packed closely together like the palisade mesophyll cells? Explain your answer.
Answers
Answer:
It would interfere with photosynthesis
Explanation:
Photosynthesis is a key biological process that involves the exchange of CO2 and O2 between the atmosphere and plant leaves via pores in the leaves. Spongy mesophyll tissue is packed loosely for efficient gas exchange. If they were tightly packed together it would interfere with the photosynthesis process as gas cannot be properly absorbed nor expelled.
I would greatly appreciate it if you could give me the brainliest answer crown!
Due today. Will you help me i have a C and need to make it a B and will mark brainiliest
Watch the video above about human evolution from TedEd Talks.
Respond to the following questions in your prompt:
Describe/explain at least TWO examples of evidence that humans are still evolving (according to the video).
Describe on adaptation that you think could evolve in humans that could be beneficial (that was NOT on the video).
Answers
Answer:
The video says that Tibetan people from birth have higher oxygen saturation due to evolution.
The video says that people in Siberia and the high arctic have adapted to survive extreme cold.
I think that one evolution that could be beneficial to humans is the ability to have more tougher skin because our skin doesn't have too many layers.
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day! Hope you get an A in that class!!!!
I do not think that any new beneficial adaptation could evolve in the human population. Modern medicine and society has created a situation where there is no longer differential reproductive success between individuals. What historically may have been a beneficial trait, no longer plays a major role in determining the relative fitness of an individual. For this reason, natural selection does not act on new traits within the human population and these traits to not rise in frequency in the population overtime. It is possible that new beneficial traits are introduced into the population by mutation, but these traits certainly won’t reach fixation in the population due to lack of natural selection on these traits. The frequency of these traits will be determined primarily by random changes in the frequency of these traits over time (genetic drift).
Cellular Respiration releases energy by breaking down:
A. Water
B. Food molecules
C. Carbon Dioxide
D. ATP
Answers
Answer:
The answer to this question is B.
Explanation:
Summary. Through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP.
Mammalian steroid hormones are signaling molecules that function in which type of cell signaling?.
Answers
The correct answer is endocrine.
What is steroid hormones?The steroids that are made virtually solely in the adrenal glands are cortisol, 11-deoxycortisol, aldosterone, corticosterone, and 11-deoxycorti-coaster one. Most different steroid hormones, including the estrogens, are produced by the adrenal glands and the gonadsSteroids have an essential role in growth, development, sexual differentiation, and reproduction. All four categories of steroids, androgens, estrogens, progestogens, and glucocorticoids, contain varying impacts on the brain.Insulin is a protein chain or peptide hormone. There are 51 amino acids in an insulin molecule. It has a molecular weight of 5808 Da. Insulin is created in the islets of Langerhans in the pancreas.To learn more about steroid hormones, refer to:
https://brainly.com/question/14136295
#SPJ4
answer this pls (the blanks0
Answers
Answer:
DNA and RNA
Explanation:
the transformation
protein synthesis is a multistep process. put the steps of protein synthesis in sequential order.
Answers
Answer:
Replication - Transcription - Translation
Explanation:
Replication duplicates the DNA so that happens first. Then in transcription converts the DNA to mRNA which goes to the cytoplasm to make proteins. In translation proteins are made when codons and anti codons join to make amino acids which create the proteins.
help pls Its due in 16 hours
Answers
Answer:
what is the question? please let me know
How are the hip bones in a frog different from the human pelvis?
Answers
Answer:
A frog's pelvis(hip bones) can slide up and down its spine, which may help it jump. The vertebrae at the bottom end of the spine are fused into one bone called the urostyle much like our coccyx(tailbone) - the remains of their tadpole tail.
how is cytokinesis different in plant and animal cells
Answers
Answer:
The main difference between plant cell and animal cell cytokinesis is the formation of new cell wall surrounding the daughter cells. Plant cells form a cell plate between the two daughter cells. In animal cells, a cleavage furrow is formed between the two daughter cells.
which of the following is the primary function of rna molecule? group of answer choices transmit genetic information to offspring function in the synthesis of proteins act as a pattern or blueprint to form dna make a copy of itself, thus ensuring genetic continuity
Answers
The primary function of RNA molecule is: function in the synthesis of proteins.
RNA stands for Ribonucleic Acid. It acts as a genetic material found in a few organism, particularly viruses. There are various forms of RNA but the major ones are: m-RNA, r-RNA and t-RNA. The m-RNA in eukaryotic organism acts a a transcript of DNA for the synthesis of proteins.
Proteins are the biomolecules synthesized by the polymerization of amino acids. the proteins are mainly involved in all the body functions like transport, catalytic, signaling, structural, etc. The proteins are mainly synthesized in the cytoplasm of the cell.
To know more about proteins, here
brainly.com/question/29776206
#SPJ4
50 points and brainliest
Drag each tile to the correct box. Not all tiles will be used.
Mitosis is a type of cell division. Organize the images below to show the steps of mitosis.
Answers
Answer:
The lesson provided all the information, and I got a 100%
Explanation:
Severe flooding in an area caused a population of minnows to become split into two separate ponds. Prior to the separation, the
male minnows all had a moderate number of spots
Following the separation, the first pond was filled with larger fish that fed on minnows, so male minnows with fewer spots were
better able to avoid detection by predators. The minnows in the second pond, however, had very few predators, and female
minnows in this pond preferred to mate with males that had the most spots,
After many generations, the two minnow populations evolved into different species and could no longer interbreed.
Fish Species Average # of Spots
Original Species four to six
New Species 1 zero to two
New Species 2 eight to ten
Which of the following best describes why the two minnow populations evolved into separate species?
Answers
Answer:
Different selective pressures were acting upon the two populations, leading to an increase in genetic variation and the formation of two new species.
When detecting the location of a sound, we determine which ear the sound arrives at first and assume that the sound comes from that side of the body. The brain determines the difference between when the sound arrives in our left ear and in our right ear. This is known as:
Answers
The process of detecting the location of a sound based on the difference in arrival time between the left and right ears is known as binaural hearing or binaural localization.
This is because the brain uses information from both ears to localize sound in three-dimensional space. When detecting the location of a sound, we determine which ear the sound arrives at first and assume that the sound comes from that side of the body.
The brain determines the difference between when the sound arrives in our left ear and in our right ear. This is known as Interaural Time Difference (ITD).
To know more about binaural localization visit:-
https://brainly.com/question/28320485
#SPJ11
What are the products of Cellular Respiration?
1. Oxygen and Water
2. Glucose and Carbon Dioxide
3. Water
4. Carbon Dioxide and Water
Answers
Answer: I think the answer is number 4 I hope this right. Mark brainlist have a wonderful day and next year and more
Explanation:
Cellular respiration coverts oxygen and glucose into water and carbon dioxide. Water and carbon are by- products and ATP is energy that is transformed from process.
The three products of cellular respiration are ATP energy, carbon dioxide, and water.
The end products of cellular respiration are ATP, carbon dioxide, and water.