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Calcium is important in skeletal muscle contraction because it
Options
(a) Prevents the formation of bonds between the myosin cross bridges and the actin filament
(b) Detaches the myosin head from the actin filament
(c) Activates the myosin ATPase by binding to it
(d) Binds to troponin to remove the masking of active sites on actin for myosin
Correct Answer:
Binds to troponin to remove the masking of active sites on actin for myosin
Explanation:
Signal for contraction increase Ca++ level many folds in the sarcoplasm.•Ca++ now binds with sub-unit of troponin (troponin “C”) which is masking the active site on actin filament and displaces the sub-unit of troponin.• Once the active site is exposed, head of the myosin attaches and initiate contraction by sliding the actin over myosin.
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Topics: Locomotion and Movement
(106)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Carotid artery supplies oxygenated blood to
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- Which body of the Government of India regulates GM research and safety of introducing
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- Which of the following are not true cells in the blood?
Topics: Locomotion and Movement (106)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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