Which Is TRUE About the Initial Segment of an Axon

question 88

Multiple Choice

Which is TRUE about the initial segment of an axon?

• A)Its threshold potential is more positive than that of the cell body and dendrites.
• B)Its threshold potential is more negative than that of the cell body and dendrites.
• C)Synapses far from the initial segment are more effective in influencing whether an action potential will be generated in the axon than are synapses close to the initial segment.
• D)It is the region where neurotransmitter vesicles are docked and ready to be released by exocytosis.
• E)It can only conduct graded potentials because it lacks voltage-gated Na⁺ channels.

---

Definitions:

Knock-In Mice

Genetically engineered mice in which a gene has been precisely altered by the insertion of a modified gene or a reporter gene at a specific locus.

Knockout Mice

Genetically engineered mice in which one or more specific genes have been made inoperative to study gene function.

Huntington Disease

A genetic neurodegenerative disorder characterized by motor dysfunction, cognitive decline, and psychiatric symptoms.

Genetic Determinants

Refers to the specific genes and variations in an organism's DNA that contribute to its physical, behavioral, and health-related traits.