8.25.23 BY264 Chapter 11.2

Which of the following is the correct sequence of events of an action potential?

• hypopolarization, depolarization, hyperpolarization

• depolarization, repolarization, hyperpolarization

• depolarization,

  hyperpolarization,

  repolarization

• hyperpolarization, repolarization, depolarization

This type of unmyelinated fiber has the smallest diameter fibers and the slowest conduction speed.

• type A

• type B

• type C

This neurotransmitter is synthesized from
tryptophan and functions in mood regulation,
emotion, feeding behaviors, and daily rhythms.

• serotonin

• dopamine

• acetylcholine

• norepinephrine

This type of receptor is ligand gated and
directly controls movements of ion in/out of neuron
when bound to neurotransmitter:

• metabotropic receptor

• ionotropic receptor

The threshold for neurons is
typically?

• -90mV

• -70mV

• -55mV

• +30mV