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During muscle contraction in humans the [NEET Kar. 2013]
- a)Actin filaments shorten
- b)Sarcomere does not shorten
- c)A band remain same
- d)A, H and I bands shorten
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
During muscle contraction in humans the [NEET Kar. 2013]a)Actin filame...
Increase in Ca++ level into the sarcoplasm leads to the binding of calcium with a subunit of troponin on actin filaments and there by remove the masking of active sites for myosin. Utilising the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge. This pulls the attached actin filaments towards the centre of ‘A’ band. The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere, i.e., contraction. It is clear from the above steps, that during shortening of the muscle, i.e., contraction, the ‘I’ bands get reduced, whereas the ‘A’ bands retain the length.
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Most Upvoted Answer
During muscle contraction in humans the [NEET Kar. 2013]a)Actin filame...
Muscle contraction in humans is a complex process that involves the interaction between actin and myosin filaments within muscle cells. The process of muscle contraction results in the shortening of muscle fibers, which in turn causes movement in the body.
A band remains the same:
- The A band is the region of the sarcomere where the thick myosin filaments are located. During muscle contraction, the myosin filaments slide past the actin filaments, causing the sarcomere to shorten.
- However, the A band remains the same length during muscle contraction because the myosin filaments do not change in length.
H and I bands shorten:
- The H band is the region of the sarcomere where only myosin filaments are present. During muscle contraction, the H band becomes smaller as the myosin filaments move closer together.
- The I band is the region of the sarcomere where only actin filaments are present. During muscle contraction, the I band becomes smaller as the actin filaments are pulled towards the center of the sarcomere.
Actin filaments do not shorten:
- Actin filaments are anchored to the Z-line, which forms the boundary of the sarcomere. During muscle contraction, the actin filaments are pulled towards the center of the sarcomere, but they do not change in length.
In conclusion, during muscle contraction in humans, the A band remains the same length, while the H and I bands shorten. Actin filaments do not shorten, but are pulled towards the center of the sarcomere.
A band remains the same:
- The A band is the region of the sarcomere where the thick myosin filaments are located. During muscle contraction, the myosin filaments slide past the actin filaments, causing the sarcomere to shorten.
- However, the A band remains the same length during muscle contraction because the myosin filaments do not change in length.
H and I bands shorten:
- The H band is the region of the sarcomere where only myosin filaments are present. During muscle contraction, the H band becomes smaller as the myosin filaments move closer together.
- The I band is the region of the sarcomere where only actin filaments are present. During muscle contraction, the I band becomes smaller as the actin filaments are pulled towards the center of the sarcomere.
Actin filaments do not shorten:
- Actin filaments are anchored to the Z-line, which forms the boundary of the sarcomere. During muscle contraction, the actin filaments are pulled towards the center of the sarcomere, but they do not change in length.
In conclusion, during muscle contraction in humans, the A band remains the same length, while the H and I bands shorten. Actin filaments do not shorten, but are pulled towards the center of the sarcomere.
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During muscle contraction in humans the [NEET Kar. 2013]a)Actin filaments shortenb)Sarcomere does not shortenc)A band remain samed)A, H and I bands shortenCorrect answer is option 'C'. Can you explain this answer?
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