MUSCLE PHYSIOLOGY

PHYSIOLOGY

SKELETAL MUSCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What is the unstoppable electrical current that travels down the length of the entire surface of a sarcolemma? (pg. 190)
A
neuromuscular junction
B
action potential
C
neurotransmitter
D
acetylcholine
Explanation: 

Detailed explanation-1: -action potential action potential is the unstoppable electric current that travels down the len…

Detailed explanation-2: -A skeletal muscle action potential is generated when the motor endplate potential is sufficient to raise the surrounding sarcolemmal potential above the threshold for activation of the voltage gated Na+ channels that are abundant throughout the sarcolemma.

Detailed explanation-3: -The T-tubules carry the action potential into the interior of the cell, which triggers the opening of calcium channels in the membrane of the adjacent SR, causing Ca++ to diffuse out of the SR and into the sarcoplasm.

Detailed explanation-4: -The neuromuscular junction (NMJ) is a synaptic connection between the terminal end of a motor nerve and a muscle (skeletal/ smooth/ cardiac).

There is 1 question to complete.