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Aleonysh [2.5K]
3 years ago
5

Which of the following factors influence the velocity and duration of muscle contraction?A. muscle fiber sizeB. length of muscle

fibers activatedC. load placed on the muscleD. frequency of stimulation
Biology
1 answer:
lina2011 [118]3 years ago
5 0

Answer:

Answer is C. Load placed on the muscle.

Explanation:

Muscle contraction is a situation whereby the length of the muscle becomes shorten. This is because of the response of the muscle to any external force.

Note that , muscle contraction is very important because it helps in posture,[ sitting and standing], and heat production.

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How does a diversity of organisms increase the chances that some will survive a major change in environment ?
Slav-nsk [51]
<h2>Answer:</h2>

This can be explained with an example.

Let’s lake an example of two species 1 and 2.

Species 1 has a wide genetic diversity due to which organism are also diverse in phenotype. Their phenotype are:  

Black, dark brown, brown, dark red, red, light red, pink, skin color.

From left to right organism are becoming less adapted to high temperature relatively.

For species 2:  This species has less genetic diversity and its phenotypic diversity is as follow:

Black, red, Skin color.

From left to right organism are becoming less adapted to high temperature relatively.

Now if there is the sudden high temperature in the environment; 4 Types of phenotype will survive are black, dark brown, brown, dark red.

While there will only two types of organism in specie 2 which will survive are black, red.

So that’s how the diversity of organisms increase the chances that some will survive a major change in environment.


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3 years ago
(5.01 LC)Which of the following is an example of a biotic factor?
Irina-Kira [14]
The example of a biotic factor is the shrimp population in a bay. Biotic factors are living factors that affect organisms in an ecosystem. The biotic factors includes the producers or autotrophs, consumers or heterotrophs, and decomposer. Abiotic factors on the other hand are the non-living factors that influence an ecosystem; they include, sunlight, soil, humidity, etc
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Li-Fraumeni syndrome (LFS1) is a rare hereditary disorder that leads to a predisposition to cancer. This hereditary disorder is
Nimfa-mama [501]

Answer:

CHK2, p53, p21, cell cycle progression.

Explanation:

In a normal cell with no LFS mutation, during the G1 stage of cell cycle progression, the CHK2 activates if there is damage in the DNA. CHK2 activates p53, which is a tumor suppressor protein that will hold the cell cycle in G1/S until the DNA is repaired. The p53 protein activates p21, a protein that binds to CDK2 and stops the cell cycle. The cell cycle will continue once the damage is repaired.      

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spayn [35]

Answer:

All the above

Explanation:

I'm not 100% sure this is accurate. Good Luck!

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STatiana [176]
<span>When breeding season arrives, male elephant seals define and defend territories. They collect a harem of 40 to 50 females, which are much smaller than their enormous mates. </span>
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