Question

Which area of the axon does the plasma membrane exhibit chemically gated ion channels?

a. Axon hillock.
b. Initial segment.
c. Nodes of Ranvier.
d. Axon terminals.

Answer 1

The plasma membrane exhibits chemically gated ion channels in the axon hillock and initial segment of the axon.

Step-by-step explanation:

The chemically gated ion channels in the plasma membrane are primarily found in the axon hillock and the initial segment of the axon.

The axon hillock is a tapered region of the neuron cell body that gives rise to the axon. It is located at the base of the neuron where the axon begins. The plasma membrane in this area contains chemically gated ion channels, which open or close in response to specific neurotransmitters binding to them.

The initial segment is the first stretch of the axon that carries the electrical signal away from the cell body. It is also known as the axon hillock. The plasma membrane in the initial segment also exhibits chemically gated ion channels, allowing for the regulation of ion flow and the generation of action potentials.