Question

The sequence of muscular contraction is known as_________

Answer 1

Explanation:

Active sites for myosin(Thick filament) 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 center of ‘A’ band.

The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere, i.e., contraction. Hence the ‘I’ band and 'H' band get reduced, whereas the ‘A’ bands retain the length.

Answer:

So, Correct answer is 'Stimuli Neurotransmitter secretion →→ Excitation of T-system →→ Release of Ca  

2

+ →→ Cross-bridges formation →→ Sliding of actin filaments →→ H band diminishes'

Answer 2

Answer:

The sequence of mascular contraction is known as strength of movement.