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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
- A baby boy aged two years is admitted to play school and passes through a
- A drop of each of the following, is placed separately on four slides
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- Which of the following does not favour the formation of large quantities of dilute urine?
- If kept in 08 NaCI RBCs will
Topics: Locomotion and Movement (106)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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