PHYSIOLOGY
MUSCLE CONTRACTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
The point at which the nerve cell reaches the sarcolemma of the muscle fiber is the ____
|
|
Neurotransmitter
|
|
|
Acetylcholine
|
|
|
Synaptic cleft
|
|
|
Neuromuscular Junction
|
Explanation:
Detailed explanation-1: -Between the synaptic end bulbs of the neuron and the cell membrane of the muscle fiber (the sarcolemma) lies a space known as the synaptic cleft, which is the final component of the neuromuscular junction.
Detailed explanation-2: -The neuromuscular junction (NMJ) is a synaptic connection between the terminal end of a motor nerve and a muscle (skeletal/ smooth/ cardiac).
Detailed explanation-3: -Embedded in the sarcolemma (= fiber membrane) at the neuromuscular junction are (nicotinic) receptors for acetylcholine (ACh). This is the neurotransmitter that is released by the terminal branches of a motor neuron. An enlargement of an ACh receptor reveals that it is composed of five (5) polypeptide subunits.
There is 1 question to complete.