Which neurotransmitter is released when a patient's ...

[tiffannnnyyyyyy]

Which neurotransmitter is released when a patient's parasympathetic motor neurons are stimu-lated?
 
  a. Epinephrine
  b. Serotonin
  c. Acetylcholine
  d. Substance P

Question 2

Which structure ensures collateral blood flow from blood vessels supplying the brain?
 
  a. Carotid arteries
  b. Basal artery
  c. Circle of Willis
  d. Vertebral arteries

[ryrychapman11]

Answer to Question 1

ANS: C
Parasympathetic motor neurons release acetylcholine. Adrenergic motor neurons release epineph-rine. Serotonin is associated with the brain. Substance P is a neurotransmitter in pain transmission pathways. Blocking the release of substance P by morphine reduces pain.

Answer to Question 2

ANS: C
The circle of Willis ensures collateral blood circulation. Collateral circulation is not associated with the basal artery or the vertebral arteries. The carotid arteries supply the brain.