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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
- In honey, the main constituent is
- Which of the following induces cell division in a cell
- The process by which organisms with different evolutionary history evolve similar
- Asthma may be attributed to
- Compound tissue is defined as
Topics: Locomotion and Movement (106)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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