Assertion`: -` `Ca^(++)` play an important role in the muscle contraction.
Reason`:-` Calcium bind with a subunit of troponin on actin filaments and thereby remove the masking of active sites for myosin.

Assertion : Ca^(2+) plays important role in the muscle contraction. Reason : Ca^(2+) Combines with troponin chain, displacing tropomyosin allowing the myosin head part to combine with actin to from actomyosin complex .

Assertion : Ca^(2+) plays important role in the muscle contraction. Reason : Ca^(2+) Combines with troponin chain, displacing tropomyosin allowing the myosin head part to combine with actin to from actomyosin complex .

Assertion : Ca^(2+) plays important role in the musclc contraction. Reason : Ca^(2+) Combines with troponin chain, displacing tropomyosin allowing the myosin head part to combine with actin to from actomyosin complex . (a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion. (b (b) If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion. (c) If Assertion is true, but Reason is false . (d) If both Assertion and Reason are false.

In resting stage, binding sites for myosin on actin filaments are masked by

In resting stage, binding sites for myosin on actin filaments are masked by

In resting stage, binding sites for myosin on actin filaments are masked by

In resting stage, binding sites for myosin on actin filaments are masked by

Arrange the following events of muscle contraction in the sequence : (i) Generate an action potential in the sarcolemma (ii) Form a cross bridge (iii) Release a neurotransmitter (Acetylcholine) (iv) Release of calcium ions in sarcoplasm (v) Pulls the attached actin filaments towards the centre of "A" band (vi) Remove the masking of active sites for myosin The correct option is :-

During muscular contraction, the myosin head binds to the exposed active sites on actin to form a