What is neuroregulin (NRG)and what is its role in muscle function?
A) It is a chemical mediator that initiates signals from the anterior horn cell of the spinal card to the axon of motor nerve branches of groups of muscle fibers.
B) It is a neurotransmitter that provides a means of reporting changes in length,tension,velocity,and tone in muscles.
C) It is a proteoglycan secreted by neurons that increases acetylcholine receptors.
D) It is a mechanoreceptor that lies parallel to muscle fibers and responds to muscle stretching.

Question

Quizplus · Accepted Answer

Neuroregulin (NRG) is a type of proteoglycan that is secreted by neurons and has been shown to play a role in the development of the neuromuscular junction. Specifically, NRG is thought to increase the number of acetylcholine receptors (AChR) on the surface of muscle fibers, which can enhance signal transmission between motor neurons and muscles. This increase in AChR density has been observed in both developing and mature neuromuscular junctions.

What Is Neuroregulin (NRG)and What Is Its Role in Muscle