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During muscle contraction in humans the
Options
(a) Actin filaments shorten
(b) Sarcomere does not shorten
(c) A band remain same
(d) A, H and I bands shorten
Correct Answer:
A band remain same
Explanation:
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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Question Type: Memory
(964)
Difficulty Level: Easy
(1008)
Topics: Locomotion and Neural Control
(33)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A certain patient is suspected to be suffering from Acquired Immuno Deficiency Syndrome
- From a diploid condition of 2N, which condition can arise due to non-disjunction
- Which of the following acts a slow neurotransmitter?
- Biscuspid valve regulates the flow of blood from
- Foramen of Monro is an aperture between
Question Type: Memory (964)
Difficulty Level: Easy (1008)
Topics: Locomotion and Neural Control (33)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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