Adrenergic synapses containing alpha receptors are primarily ...

[nummyann]

Adrenergic synapses containing alpha receptors are primarily responsible for which function?
 
  1. Release of intracellular calcium
  2. Inhibiting vasoconstriction of the bronchioles
  3. Constriction of arterioles in the kidneys
  4. Increasing the strength of contraction in the coronary arteries

Question 2

The termination of norepinephrine (NE) occurs through the process of reuptake. Which phrase best describes this phenomenon?
 
  1. Movement of NE to the adrenergic receptor sites.
  2. Release of NE into the bloodstream.
  3. Storage of NE in preganglionic nerves for future use.
  4. Destruction of NE by the enzyme catechol-O-methyltransferase (COMT).

[ririgirl15]

Answer to Question 1

Correct Answer: 1
Rationale 1: Release of intracellular calcium is an alpha response.
Rationale 2: Alpha receptors are responsible for the release of intracellular calcium stores and inhibitory actions.
Rationale 3: Constriction of arterioles in the kidneys relates to dopamine receptors.
Rationale 4: Increasing the strength of contraction in the coronary arteries is a beta response.
Global Rationale: Release of intracellular calcium is an alpha response. Alpha receptors are responsible for the release of intracellular calcium stores and inhibitory actions. Constriction of arterioles in the kidneys relates to dopamine receptors. Increasing the strength of contraction in the coronary arteries is a beta response.

Answer to Question 2

Correct Answer: 3
Rationale 1: This is not the definition of reuptake.
Rationale 2: This is not the definition of reuptake.
Rationale 3: Reuptake is the process of storing NE for future use.
Rationale 4: This is not the definition of reuptake.
Global Rationale: Reuptake is the process of storing NE for future use. The other phrases do not adequately describe reuptake.

[nummyann]

Excellent

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