CH 6 Questions

Question 1

A 3-year-old child has been admitted to the emergency department having swallowed the contents of 2 bottles of a nasal decongestant. The active ingredient of the medication
is a potent, selective α-adrenoceptor agonist drug. Which of the following is a sign of α-receptor activation that may occur in this patient?
(A) Bronchodilation
(B) Cardiac acceleration (tachycardia)
(C) Pupillary dilation (mydriasis)
(D) Renin release from the kidneys
(E) Vasodilation of the blood vessels of the skin

Answer 1

(C) Pupillary dilation (mydriasis)

Question 2

Mr Green is a 60-year-old man with poorly controlled hypertension of 170/110 mm Hg. He is to receive minoxidil. Minoxidil is a powerful arteriolar vasodilator that does not act on autonomic receptors. Which of the following effects will be observed if no other drugs are used?
(A) Tachycardia and increased cardiac contractility
(B) Tachycardia and decreased cardiac output
(C) Decreased mean arterial pressure and decreased cardiac contractility
(D) Decreased mean arterial pressure and increased salt and water excretion by the kidney
(E) No change in mean arterial pressure and decreased cardiac contractility

Answer 2

(A) Tachycardia and increased cardiac contractility

Question 3

Full activation of the parasympathetic nervous system is likely to produce which of the following effects?
(A) Bronchodilation
(B) Decreased intestinal motility
(C) Increased thermoregulatory sweating
(D) Increased pupillary constrictor tone (miosis)
(E) Increased heart rate (tachycardia)

Answer 3

(D) Increased pupillary constrictor tone (miosis)

Question 4

Assuming the structure is part of the thoracolumbar system, norepinephrine acts at which of the following sites in the diagram?
(A) Sites 1 and 2
(B) Sites 3 and 4
(C) Sites 5 and 6

Answer 4

(C) Sites 5 and 6

Question 5

If the effector cell in the diagram is a pupillary constrictor smooth muscle cell, which of the following receptor types is denoted by structure 6?
(A) Alpha1 adrenoceptor
(B) Beta2 adrenoceptor
(C) M3 cholinoceptor
(D) Ng cholinoceptor

Answer 5

(C) M3 cholinoceptor

Question 6

Nicotinic receptor sites do not include which one of the following sites?
(A) Bronchial smooth muscle
(B) Adrenal medullary cells
(C) Parasympathetic ganglia
(D) Skeletal muscle end plates
(E) Sympathetic ganglia

Answer 6

(A) Bronchial smooth muscle

Question 7

Several children at a summer camp were hospitalized with symptoms thought to be due to ingestion of food containing botulinum toxin. Which one of the following signs or symptoms is consistent with the diagnosis of botulinum
poisoning?
(A) Bronchospasm
(B) Cycloplegia
(C) Diarrhea
(D) Skeletal muscle spasms
(E) Hyperventilation

Answer 7

(B) Cycloplegia

Question 8

Which one of the following is the primary neurotransmitter agent normally released in the sinoatrial node of the heart in response to a blood pressure increase?
(A) Acetylcholine
(B) Dopamine
(C) Epinephrine
(D) Glutamate
(E) Norepinephrine

Answer 8

(A) Acetylcholine

Question 9

Which of the following blocks the carrier represented by “z” in the diagram?
(A) Amphetamine
(B) Botulinum toxin
(C) Cocaine
(D) Hemicholinium
(E) Reserpine

Answer 9

(C) Cocaine

Question 10

Which of the following inhibits the carrier denoted “y” in the diagram?
(A) Cocaine
(B) Dopamine
(C) Hemicholinium
(D) Reserpine
(E) Vesamicol

Answer 10

(D) Reserpine