Question

What two mechanisms can be combined to regulate the strength of a muscle contraction?

A.The intensity of the action potential and variable inhibition of Ca2+ release.

B.	The type of muscle fiber activated and the number of neurons activating each fiber

C.	Action potential frequency and selective recruitment of motor units

D.	Spindle fiber activation and neural myelination

Answer 1

option A is correct.

signalling process for muscle contraction action potential occurs with release of calcium ions.

Muscle cells have acetylcholine gated calcium receptors which are responsible for the entry of calcium ions inside the cytoplasm which relates to muscle contraction.

Action potential is the potential of changing charge of cell which leads to opening and closing of various voltage gated channels. in the action potential cell become depolarize due to entry of calcium in cytoplasm which leads to various other signalling and ultimately muscle contraction.