A key event for the release of neurotransmitter from the ...

[savannahhooper]

A key event for the release of neurotransmitter from the presynaptic membrane is the
 
  A) hyperpolarization of the axon membrane.
  B) arrival of an action potential at the axon terminal.
  C) influx of potassium ions into the axon terminal.
  D) activation of the sodium-potassium pumps.
  E) opening of ion channels within the microtubules.

Question 2

Match up the receptor type with its action.
 
  A) metabotropic; direct opening of an ion channel
  B) ionotropic; more time required to open an ion channel
  C) metabotropic; G-protein activation leads to activation of a second messenger
  D) metabotropic; second messenger effects are specific to opening ion channels
  E) metabotropic; rapid and short-lived effects on ion channels

[lucas dlamini]

Answer to Question 1

Answer: B

Answer to Question 2

Answer: C
Rationale: In metabotropic receptors, G-protein activation leads to activation of a second messenger.

[savannahhooper]

Wow, this really help

[momolu]

Excellent