Question

which of the following is true of axons?
smaller (thinner) axons are more likely to bear myelin sheaths than larger (thicker) axons.
neurons can have multiple axons but only one dendrite.
a neuron can have only one axon, but the axon may have occasional branches along its length.
axons use chemically gated ion channels to generate graded potentials.

Explanation:

1. Analyze the first option: Larger (thicker) axons are more likely to be myelinated than smaller (thinner) ones, so this is false.
2. Analyze the second option: Neurons typically have one axon and multiple dendrites, not multiple axons and one dendrite, so this is false.
3. Analyze the third option: A neuron generally has a single axon, and the axon can have collateral branches (occasional branches) along its length, which is a correct statement about axons.
4. Analyze the fourth option: Axons use voltage - gated ion channels to generate action potentials, while graded potentials are often generated by chemically gated ion channels in dendrites and the cell body, so this is false.

Answer:

C. A neuron can have only one axon, but the axon may have occasional branches along its length.