Question

When a muscle receives a signal from the nerves around it,the signal travels down the cell’s membrane in folds called t-tubles. What will happen next to continue the contraction process A)the sacroplasmic reticulum releases its stored calcium B)troponmyosin changes position on the actin filaments C) ATP molecules bind to the myosin heads and hydrolyze D)calcium ions enter the sarcomere and attach to troponin

Answer 1

When the muscle receives a signal from the nerves around it the sarcoplasmic reticulum will release its stored calcium.

Answer 2

The correct answer will be option-A

Step-by-step explanation:

A skeletal muscle comes into action when it receives a signal from the Central nervous system in the form of the action potential.

The action potential triggers the release of the neurotransmitter called Acetylcholine which causes depolarization in the motor endplate. The depolarized signal is transferred from the motor endplate to sarcolemma through T-tubules which innervate the muscle cells.

The action potential then triggers the release of the calcium ions from the sarcoplasmic reticulum to sarcoplasm of the muscle cell. This activates troponin which causes the muscle cell to move.

Thus, option-A is the correct answer.