Question

QUESTION 8

1. When released from the axon terminal, neurotransmitter will diffuse across the "cleft" and bind to receptors on the:

   	A.	T Tubule.
   	B.	terminal cisternae of the sarcoplasmic reticulum.
   	C.	motor end plate.
   	D.	myofilament.
   	E.	myosin.

Answer 1

Answer is option (c) Motor end plate

A nerve fiber divides into many terminal branches. Each of them end on a region of muscle fibre. It's called Motor end plate. It has several receptors on it.

Neurotransmitter when released into synaptic cleft will them bind to these receptors present on Motor end plate. It causes sodium channels to open and sodium influx initiates end plate potential. This leads to muscle contraction.

**T-tubules are extensions of cell membranes in skeletal and cardiac muscle cell.

**terminal cisternae of the sarcoplasmic reticulum are enlarged areas which surround T-tubules.

**Myofilaments are filaments of myofibrils which is made of actin and myosin.

**myosin is a protein filament found in the cell.