Question

For contraction of muscle, protein synthesis and conduction of nervous impulses. the energy source is​

Answer 1

Answer:

protein I think

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Answer 2

Explanation:

neural signal reaching this junction releases a neurotransmitter (Acetylcholine) which generates an action potential in the sarcolemma. This spreads through the muscle fibre and causes the release of calcium ions into the sarcoplasm

Active sites for myosin are present on actin which are masked by troponin-C in resting state. When Ca++ level increases it leads to the binding of calcium with a subunit of troponin i.e Troponin-C on actin(thin) filaments and thereby remove the masking of active sites for myosin.

Utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge.

This pulls the attached actin filaments towards the centre of ‘A’ band.

The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere, i.e., contraction. The myosin, releasing the ADP and P1 goes back to its relaxed state. Hence Ca

2+

is required for muscle contraction and nerve impulse transmission.

So, the correct answer is 'Ca 2+'.