Which of the following option shows correct order of some stages of muscles contraction from the beginning to the end of the process ?

Options

A. Stimuli `to` Neurotransmitter secretion `to` Release of `Ca^(+) to` Cross bridges formation `to` Excitation of T-system `to` Sliding of actin filaments
B. Stimuli `to` Neurotransmitter secretion `to` Excitation of T-system `to` Release of `Ca^(2+)to` Cross bridges formation `to` Sliding of actin filaments `to` 'H' band diminishes
C. Stimuli `to` Excitation of T-system `to` Neurotransmitter secretion `to` Cross bridges formation `to` Sliding of actin filaments `to` H-band diminishes
D. Stimula `to` Neurotransmitter secretion `to` Cross bridges formation `to` Excitation of T-system `to` Sliding of actin filaments

Answer

b

Explanation

The contraction of skeletal muscle includes ultrastructural and biochemical events. Ultrastructural events leads with stimuli excitation of T-system followed by crossbridge formation (myosin and actin filaments involved) and the cross bridge breakage. THe biochemical events explain that stimuli lead to neurotransmitter secretion, excitation of T-system and release of `Ca^(2+)`