Identify what happens during muscle relaxation.

A. Ca\[^{2+}\] moves back into the SR by facilitated diffusion.
B. Ca\[^{2+}\] moves back into the SR by active transport.
C. An ATP-fueled Ca\[^{2+}\] pump is involved.
D. A and C
E. B and C

Question

16-03-2024
Biology

High School

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Identify what happens during muscle relaxation.

A. Ca\[^{2+}\] moves back into the SR by facilitated diffusion.
B. Ca\[^{2+}\] moves back into the SR by active transport.
C. An ATP-fueled Ca\[^{2+}\] pump is involved.
D. A and C
E. B and C

Answer :

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shub30990 shub30990 · Answer 1 · 2023-08-18T14:29:09-04:00

Final answer:

During muscle relaxation, calcium ions are actively transported back into the sarcoplasmic reticulum by an ATP-driven pump. The tropomyosin then reshields the binding sites on the actin strands, causing the muscle fibers to lose tension and relax.

Explanation:

In the process of muscle relaxation, two primary processes occur. Firstly, there is the return of calcium ions back into the sarcoplasmic reticulum (SR), an action achieved through active transport. This process requires energy and is facilitated by an ATP-driven calcium pump, thereby making options B and C correct. This statement denotes that option E is the rightful answer to the question, given that it comprises of options B and C.

Once the calcium ions are back in the SR, tropomyosin reshields the binding sites present on the actin strands, effectuating the muscle fibers to lose tension and eventually relax. It's also noteworthy that once a muscle exhausts its ATP stores, it could fail to contract and become fatigued.

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Identify what happens during muscle relaxation.A. Ca\[^{2+}\] moves back into the SR by facilitated diffusion. B. Ca\[^{2+}\] moves back into the SR by active transport. C. An ATP-fueled Ca\[^{2+}\] pump is involved. D. A and C E. B and C

Answer :

Final answer:

Explanation:

Other Questions

Identify what happens during muscle relaxation.

A. Ca\[^{2+}\] moves back into the SR by facilitated diffusion.
B. Ca\[^{2+}\] moves back into the SR by active transport.
C. An ATP-fueled Ca\[^{2+}\] pump is involved.
D. A and C
E. B and C