Question

1. name fluid - filled space e
2. name substance g
3. name structure h
4. name structure f
5. what substance is degraded by enzymes soon after binding to h?

word bank
acetylcholine
acetylcholine
acetylcholine
action potential
axon - terminal (bouton)
ca2+
chemically - gated channel
influx of calcium ions
junctional folds
neuromuscular junction (motor end plate)
synaptic cleft
synaptic vesicle
voltage - gated calcium channel

Explanation:

1. In a neuromuscular - junction, the fluid - filled space between the axon terminal and the muscle fiber is the synaptic cleft.
2. Acetylcholine is a common neurotransmitter in neuromuscular junctions.
3. Chemically - gated channels are present on the muscle fiber membrane to bind neurotransmitters.
4. Junctional folds increase the surface area of the muscle fiber membrane at the neuromuscular junction.
5. Acetylcholine is degraded by the enzyme acetylcholinesterase soon after binding to its receptors.

Answer:

1. Synaptic cleft
2. Acetylcholine
3. Chemically - gated channel
4. Junctional folds
5. Acetylcholine