Question

1. name fluid - filled space e
2. name substance g
3. name structure h chemically - gated channel
4. name structure f junction folds
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. Without further context in the image, it's hard to determine substance G precisely, but common substances in neuromuscular junctions include neurotransmitters like acetylcholine.
3. A chemically - gated channel is correctly named as given in the answer.
4. Junction folds are present on the muscle fiber side of the neuromuscular junction to increase the surface area for receptor binding.
5. Acetylcholine is the neurotransmitter that binds to chemically - gated channels at the neuromuscular junction and is quickly degraded by the enzyme acetylcholinesterase.

Answer:

1. Synaptic cleft
2. Acetylcholine (most likely based on common neuromuscular - junction substances)
3. Chemically - gated channel
4. Junction folds
5. Acetylcholine