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Locomotion and Movement question

2016 · Q10
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Locomotion and Movement question

2016 · Q10

NEETBiologyLocomotion and MovementMCQ+4 / −1
Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction.
  1. A
    Calcium
  2. B
    Magnesium
  3. C
    Sodium
  4. D
    Potassium
View written solutionFree

Correct answer: A

Calcium ion plays an important role in muscle contraction. Calcium ions bind to troponin causing a change in its shape and position. Thus, in turn alters shape and position of tropomyosin to which troponin binds. This shift exposes the active sites on F-actin molecules. Myosin cross-bridge are then able to bind to these active sites.

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