When reviewing the purpose/action of neurotransmitters as they ...

[penza]

When reviewing the purpose/action of neurotransmitters as they interact with different receptors, the nursing instructor gives an example using acetylcholine.
 
  When acetylcholine is released at the sinoatrial node in the right atrium of the heart, it is
  A)
  positively charged.
  B)
  inhibitory.
  C)
  overstimulated.
  D)
  dormant.

Question 2

The neurotransmitter GABA mainly functions to trigger inhibitory postsynaptic potentials (IPSPs). Therefore, when explaining this to a group of nursing students, the nurse will state that
 
  A)
  it takes at least three chemical substances (amino acids, neuropeptides, and monoamines) to stimulate any activity between the cells.
  B)
  there is a symbiotic relationship; therefore, the end result will be depolarization of the postsynaptic membrane.
  C)
  the combination of GABA with a receptor site is inhibitory since it causes the local nerve membrane to become hyperpolarized and less excitable.
  D)
  the neurotransmitters will interact with cholinergic receptors to bind to acetylcholine in order to produce hypopolarization within the cell.

[kristenb95]

Answer to Question 1

Ans:
B

Feedback:

The action of a transmitter is determined by the type of receptor to which it binds. Acetylcholine is excitatory when it is released at a myoneural junction, and it is inhibitory when it is released at the sinoatrial node in the heart.

Answer to Question 2

Ans:
C

Feedback:

A neurotransmitter can cause an excitatory or an inhibitory graded potential. The combination of a transmitter with a receptor site is inhibitory in the sense that it causes the local nerve membrane to become hyperpolarized and less excitable. This is called inhibitory postsynaptic potential (IPSP).