as you descend stairs leading with your right foot, describe what is happening at the left ankle. a.Concentric contraction of the left ankle dorsiflexor. B. Eccentric contraction of the left ankle plantar flexors
Answers
As you descend stairs leading with your right foot, the left ankle undergoes eccentric contraction of the plantar flexor muscles. The Correct option is B
This is because the plantar flexors, including the gastrocnemius and soleus muscles, are responsible for controlling the movement of the ankle during dorsiflexion. As you step down, the left foot is positioned on a lower step, causing the ankle joint to dorsiflex and the plantar flexors to lengthe.
In order to control this movement and prevent the foot from dropping too quickly, the plantar flexors undergo eccentric contraction to provide a controlled lowering of the foot. There is no concentric contraction of the left ankle dorsiflexor during this movement as it is being stretched and not contracting.
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As you descend stairs leading with your right foot, the left ankle is undergoing an eccentric contraction of the left ankle plantar flexors.
This means that the muscles responsible for pointing the foot downward (plantar flexion) are actively contracting while lengthening, in order to control the descent of the body down the stairs.
This is necessary to prevent the body from falling forward as the weight shifts over the descending leg.
At the same time, the left ankle dorsiflexors are undergoing a concentric contraction. These muscles are responsible for lifting the foot upwards (dorsiflexion), and are contracting to prepare the foot for the next step down.
Together, these coordinated contractions of the ankle muscles allow for safe and stable stair descent, even when leading with the opposite foot. The correct option is B.
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Related Questions
why was the evolution of a coelom a critically important innovation for animals? view available hint(s)for part a why was the evolution of a coelom a critically important innovation for animals? it enables the internal organs to move independently of the outer tubes, or exterior of the animal. the coelom separates vertebrates from invertebrates. the coelom made it possible for animals to colonize land. the coelom gives rise to a complex nervous system.
Answers
Evolution of coelom is critical because, A, it enables the internal organs to move independently of the outer tubes, or exterior of the animal.
How did the coelom evolve over time?The evolution of a coelom, or a fluid-filled body cavity surrounded by mesoderm, allowed for the development of a more complex and specialized organ system in animals. The coelom provided a space for the internal organs to move independently of the outer tubes, which allowed for greater efficiency and specialization of organ function.
It also provided protection for the organs, allowing them to be shielded from external pressures and impacts. The evolution of a coelom was a critically important innovation for animals.
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6. Sister chromatids are attached to each other at an
area called the
a. centriole.
b. centromere.
c. spindle.
d. chromosome.
Answers
Answer:
c. Spindle
Explanation:
Answer: proteins called cohesins
Explanation:
how many types of mutations are there
Answers
Answer:
Depending on changes, that occur with DNA, all types of DNA mutations can be divided into two main groups:
gene mutation;
chromosomal mutation.
Explanation:
Which Enzyme has an optimal pH that is Acidic?
A. Pepsin
B. Salivary amylase
C. Arginase
Answers
Answer:
a. pepsin
Explanation:
it has a 1 to 2 level which is acidic because anything lower than 7 is acidic
Answer:
A. Pepsin
Explanation:
The enzyme pepsin breaks down proteins in the acidic conditions of the stomach. Pepsin has an optimum of pH 2.5 and a working range of between pH 1-4.
What do water molecules do when water is a solid?
-They grow bigger and stick together.
-They lose a hydrogen atom.
-They line up and hardly move.
-They join with air molecules.
Answers
Answer: they grow bigger and stick together
Explanation:
A collision between which two types of crust will most likely produce a mountain range?
Answers
Answer:
Be more specific
Explanation:
Answer:
A convergent boundary
Explanation:
Convergent boundaries are pieces of crust that collide against each other. They push upwards, and that land that is pushed upwards is a mountain. Mount Everest is a good example. It was made in two tectonic plates, and since these plates are still pushing upwards to this day, this mountain grows around 40 cm each year. I hope this helps!
if two loci act independently during meiosis: a. they most likely contain the same gene b. they are most likely found on the same chromosome c. they are most likely found on different chromosomes d. a and b e. a and c
Answers
If two loci act independently during meiosis, they are most likely found on different chromosomes. If two loci are on the same chromosome, they can be inherited together and are not considered independent. The correct option for the given question is c) .
This statement is true because loci are the position of a gene on a chromosome and meiosis is a process that involves the separation of chromosomes. During meiosis, homologous chromosomes pair up and separate during the first meiotic division. The separation of homologous chromosomes is random and independent of each other.
This means that the genes located on different chromosomes separate independently during meiosis. The genes located on the same chromosome can segregate together if they are close to each other, which is called linkage.
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treating bacteria, like e. coli, with a cold solution of calcium chloride can make the cells more receptive to take up dna from a solution. bacterial cells prepared by this process are referred to as: group of answer choices
Answers
The ice-cold calcium chloride \(CaCl_{2}\) solution makes it easier for DNA to adhere to the cell's surface and subsequently enter the cell following a brief heat shock. Typically, selection or screening markers like drug resistance or fluorescence are used to identify altered cells.
If E. coli cells' cell walls are modified to allow DNA to pass through more freely, the likelihood that the cells will integrate foreign DNA increases. These cells are described as "capable." Among the capable cell preparation techniques, the calcium chloride transformation approach is the most effective one. It enhances plasmid DNA incorporation by the bacterial cell, promoting genetic modification. Plasmid DNA can attach to LPS by being added to the cell suspension together with calcium chloride. Thus, when heat shock is applied, the negatively charged DNA backbone and LPS combine, and plasmid DNA enters the bacterial cell.
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Pls help me for brainliest
Answers
Answer:
b new experiments will be conducted until evidence supporting the accepted theories is obtained
Answer:
C. The accepted theory will be revised or replaced
I got scammed last time I asked can you guys help me now pls
She/They
Answers
Plant systems are made of
Answers
Which risk marker has both positive and negative cardiovascular risk integrated into its measurement?
Answers
There are numerous different cardiovascular risk factors.
Ageing is a strong predictor of unfavorable outcomes, and in the case of hypertension and dyslipidemia, these parameters are the main targets for therapeutic intervention.Additionally, many novel biomarkers have been identified, including inflammatory and genetic markers.Although their efficacy in enhancing risk prediction has not yet been demonstrated, they may serve as prospective treatment targets. What are various causes of cardiovascular diseases?The term can refer to a decision made in the context of known probabilities, an unwanted event (such as a myocardial infarction).The cause of an unwanted event (such as smoking), the probability of an unwanted event, the expectation value of an unwanted event (i.e., the probability of an unwanted event multiplied by a measure of event severity, such as the probability of a myocardial infarction and the associated probability of death), and more uncertainty is another word that is frequently used. This could be a reference to randomness (such as the roll of a dice) or ignorance (of something that could potentially be confirmed) . It frequently refers to both when used in a clinical setting.To learn more about cardiovascular diseases, visit:
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advantages and disadvantages of both unicellular and multicellular organisms
Answers
Unicellular Organisums:
Unicellular organisms don't live as long and multicellular organisms. Unicellular organisms are smaller and they are faster at reproduction. Disadvantages- Unicellular organisms only have one cell that is used to function their entire being. Short life span, can't grow lager then multicellular organisms.
Multicellular organisums:
Intelligence and Evolution.
Bigger Is Better.
Less Stress Equals A Longer Lifespan.
Cells Can Take Care Of Each Other.
More Energy Is Needed For Normal Functioning.
Infection Becomes A Possibility When Multicellular.
Takes Longer To Reach Maturity And To Breed
The transcription of the information in DNA involves the pairing of the nitrogen bases of DNA with RNA nucleotides to form a molecule of messenger RNA. Choose the RNA nitrogen bases that pair with the DNA nitrogen bases listed. Be sure to use the capital letters that represent the nitrogen bases. A pairs with . C pairs with G . T pairs with A .
Answers
Answer: ASAP The transcription of the information in DNA involves the pairing of the nitrogen bases of DNA with RNA nucleotides to form a molecule of messenger RNA.
Answer:
:)))))))
Explanation:
A=U
C=G
T=A
20. Explain how the transfer of energy can be tracked as energy flows through a natural system. In other words, why are photosynthesis and cellular respiration together called “the energy cycle”?
Answers
Photosynthesis and cellular respiration are together called “the energy cycle” because the vast amount of biomass on Earth is sustained by these metabolic pathways and they are interrelated processes.
What are photosynthesis and cellular respiration?Photosynthesis and cellular respiration are two metabolic pathways that play fundamental roles to sustain life on the Earth.
Photosynthesis is a series of metabolic reactions through which plants and also algae generate biomass in the form of simple carbohydrates such as glucose, which is achieved using sunlight and carbon dioxide generated through cellular respiration.
Moreover, cellular respiration generates energy in aerobic organisms which requires the use of oxygen as a reactant obtained by the mechanism of Photosynthesis.
Therefore, with this data, we can see that photosynthesis and cellular respiration are fundamental processes to sustain life on the earth's planet and they are interrelated because the products of photosynthesis are used as reactants in cellular respiration.
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I NEED HELP! ASAPPPP PLEASEEE
Answers
Explanation:
Make a punnet square (seems like you've got one already)
It's very similar to a multiplication table.
P P
p Pp Pp
p Pp Pp
Since P is dominant over p, there are no white pea plants. 100% purple.
Hope I could help!
(eventually you'll get the hang of this, practice makes perfect!)
Which shows the correct order of forces, from weakest to strongest?
A. weak, strong, gravitational, electromagnetic
B. electromagnetic, weak, strong, gravitational
C. gravitational, weak, electromagnetic, strong
D. weak, electromagnetic, gravitational, strong
Answers
Answer:
C. gravitational, weak, electromagnetic, strong
Explanation:
What is the peculiarity of Gymnosperms?
Answers
Gymnosperms are the vascular plants that produce seeds produced over the reproductive structure but are not enclosed in the fruits and are found in the cones.
What are Gymnosperms?Gymnosperms are the plant variety that reproduces in the form of exposed ovules or seeds that are not enclosed but are not visible till maturity. They are generally of short height and have tap roots.
They are heterosporous as they bear two types of spores, microspores, and megaspores. Also, they lack beautiful flowers and are pollinated through the wind. The seed produced as a result has haploid endosperms without any covering.
Therefore, the gymnosperms do not have their seeds enclosed.
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Eggs that have allowed eggs to be laid Extra embryotic fluid; in trees An extra large embryo; in deep ocean depths A hard casing; on land A soft shell; under intense water pressure Question 9 Over a of the air was oxygen in the Carboniferous. 1/3 1/4 1/5 1/2
Answers
Over a 1/3 of the air was oxygen in the Carboniferous.
During the Carboniferous period, which lasted from approximately 359 to 299 million years ago, the Earth experienced high levels of atmospheric oxygen. The lush vegetation that thrived during this period played a crucial role in increasing oxygen levels through photosynthesis, as plants release oxygen as a byproduct. The accumulation of plant material, particularly large forests of ferns, horsetails, and early trees, led to the formation of extensive coal deposits that we see today.
The high oxygen content in the atmosphere during the Carboniferous had significant impacts on both terrestrial and aquatic ecosystems. It provided an environment conducive to the evolution of a diverse range of organisms, including giant insects and early amphibians. The availability of oxygen also supported the development of larger body sizes, such as the presence of extra-large embryos in some marine organisms adapted to deep ocean depths.
Furthermore, the higher oxygen levels likely influenced the evolution of certain reproductive adaptations in various species. For example, the development of hard casing in eggs allowed them to be laid on land, providing protection and preventing desiccation. Soft-shelled eggs under intense water pressure may have been advantageous for organisms adapted to the depths of the ocean.
Overall, the elevated oxygen levels in the Carboniferous had profound effects on the ecology and evolutionary history of life, shaping the characteristics and adaptations of organisms during this time.
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how can the misregulation/ errors in the cell cycle process cause cancer
Answers
Genetic mutations causing the malfunction or absence of one or Korean of the regulatory protiens at check cycle checkpoints can result in the "molecular switch" being turned permanently or permitting uncontrolled multiplication of cell leading to timer development
do you think you can make a difference with your family or society? how?
Answers
Answer:
this is a opinion based question
Answer:
yes you can
Explanation:
you can lent a hand around your society and help those in need
The medical term meaning instrument used to record electrical activity of the brain is?
Answers
The medical term is electroencephalograph (EEG).
An electroencephalograph (EEG) is a medical device used to record and measure the electrical activity of the brain. It consists of electrodes that are attached to the scalp and detect the electrical signals produced by the brain. These signals are amplified and displayed as a graph, allowing healthcare professionals to analyze the brain's electrical patterns and diagnose various conditions such as epilepsy, sleep disorders, and brain injuries. The term "electroencephalograph" is derived from "electro" (related to electricity), "encephalo" (referring to the brain), and "graph" (indicating a recording or representation).
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fitness trade-off refers to selection favoring which genotype?
Answers
The genotype favored by selection depends on the specific environmental conditions and the trade-offs associated with different traits. Natural selection acts to maximize the fitness of individuals in their particular environment.
In evolutionary biology, fitness trade-off refers to the concept that natural selection may favor certain traits or characteristics in an organism's genotype while simultaneously disadvantaging other traits. This trade-off occurs because resources and energy available for an organism are limited, and investing more in one trait may come at the expense of investing in another.
For example, in the context of reproduction, an organism may allocate more energy and resources towards producing a large number of offspring, resulting in higher reproductive fitness. However, this investment may come at the cost of individual survival or parental care, which could reduce the survival fitness of the organism.
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What causes the cloud of gas and dust to condense and turn into a star?
Answers
The tremendous heat given off by the nuclear fusion process causes the gas to glow creating a protostar. This is the first step in the evolution of a star. The glowing protostar continues to accumulate mass.
hope this helps ^^
Answer:Gravity
Explanation:
genome of an octopus?
Extra eyes would develop, but with octopus crystallins.
Which of the following statements about genetically controlled traits is true?
-Interactions among alleles at different genetic loci can affect the expression of a trait, such as height, in different ways from individual to individual.
-A single genotype may produce different phenotypes depending on the environment.
-A single mutation to a regulatory gene can affect many phenotypic traits.
Answers
If you inserted a Pax-6 gene from a mouse into the genome of an octopus: extra eyes would develop, but with octopus crystallins. The correct option is D.
Pax-6 is a highly conserved gene across species and is responsible for eye development. Inserting the mouse Pax-6 gene into an octopus genome would still likely trigger eye development, but since the octopus's cellular machinery would be producing the crystallins, the eyes would contain octopus crystallins rather than mouse crystallins.
Regarding genetically controlled traits, the true statement is that all of the options (a, b, and c) are correct (option d). Interactions among alleles at different genetic loci, called epistasis, can affect trait expression differently in individuals (option a).
A single genotype may produce different phenotypes depending on the environment (option b). A single mutation to a regulatory gene can affect multiple phenotypic traits (option c). These factors illustrate the complexity of genetic control and gene-environment interactions in shaping an individual's traits.
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Complete question:
1. What do you predict would happen if you inserted a Pax-6 gene from a mouse into the genome of an octopus?
a. no eyes would develop in the octopus
b. the normal two eyes would develop, but they would not work
c. extra eyes would develop, but with mouse crystallins
d. extra eyes would develop, but with octopus crystallins
2. Which of the following statements about genetically controlled traits is true?
a. interactions among alleles at different genetic loci (epistasis) can affect the expression of a trait, such as height, in different ways from individual to individual
b. a single genotype may produce different phenotypes depending on the environment
c. a single mutation to a regulatory gene can affect many phenotypic traits
d. all of the above
e. b and c only
f. none of the above
*PLEASE ANSWER !!! THANK YOU*
Which of the following statements describes a mid-intertidal zone?
a.) zone at depths of 13,000 to 20,000 feet that resembles a bottomless pit of complete darkness
b.) one of the four vertical sections of the intertidal zone regularly covered with water
c.) the area of highest elevation in ocean tidal zones
Answers
Answer:
I believe its b.
Explanation:
Where do rivers usually begin?
Answers
Answer: Rivers usually begin in Mountainous Regons.
Explanation:
Edge, 2020. Hope this helped :)
The outbreak in spread epidemic diseases such as swine flu are tracked by? A epidemiologist or a sonographer
Answers
Answer:
An epidemiologist
Answer:
A g I need the same answer homie
Explanation:
Which type of water represents the largest pretend percentage of earths water
Answers
Answer:
The ocean
Explanation:
It hold 97% of earth water
Who formulated the Universal law of Gravitation (G)
Answers
Answer: Isaac Newton
Explanation: Sir Isaac Newton put forward the universal law of gravitation in 1687 and used it to explain the observed motions of the planets and moons