Exam 2

Question 1

Which of the following drugs would elicit bronchodilationin in the lung with minimal effects on the heart?

a. an adrenergic beta 1 receptor agonist
b. an adrenergic beta 2 receptor agonist
c. an adrenergic beta 1 receptor antagonist
d. an adrenergic beta 2 receptor antagonist
e. a muscarinic cholinergic receptor antagonist

Answer 1

b. an adrenergic beta 2 receptor agonist

• one heart, two lungs*
  agonist: mimics
  antagonist: inhibit

Question 2

Stimulation of muscarinic cholinergic receptors in the heart would

a. increase intracellular K concentrations in sino-atrial node cells of the heart
b. decrease intracellular K concentrations in sino-atrial node cells of the heart
c. decrease intracellular Ca concentrations in sino-atrial node cells of the heart
d. increase intracellular Ca concentrations sino-atrial node cells of the heart
e. lower the threhold for stimulating sino-atrial node cells in the heart

Answer 2

b. Decrease intracellular K concentrations in sino-atrial node cells of the heart

Question 3

Which of the following would inhibit clot formation in a test tube?

a. fibrinogen
b. TPA
c. thrombin
d. an antagonist of Vit K activity
e. heparin

Answer 3

e. heparin

Question 4

An abnormally low hematocrit

a. occurs in polycythemia
b. leads to an increase in the oxygen carrying capacity of the blood
c. occurs following release of erythropoietin
d. leads to anemia

Answer 4

d. leads to anemia

Question 5

Systolic arterial blood pressure is reported as 140 mmHg and pulse pressure is 30 mmHg. Diastolic arterial blood pressure is:

a. 170
b. 130
c. 80
d. 110
e. 120

Answer 5

d. 110

Question 6

Which of the following events would increase the slope of phase 4 as measured in sino-atrial nodal cells of the heart?

a. stimulation of B2 adrenergic receptors in the heart
b. stimulation of B1 adrenergic receptors in the heart
c. stimulation of muscarinic cholinergic receptors in the heart
d. stimulation of nicotinic cholinergic receptors in the heart
e. stimulation of alpha adrenergic receptors in the heart

Answer 6

b. stimulation of B1 adrenergic receptors in the heart

Question 7

During the phases, an increase in sodium permeability and rapid influx of Na occurs during…

a. 0
b. 1
c. 2
d. 3
e. 4

Answer 7

a. 0

Question 8

An influx of calcium is balanced by an outflux of K during phase

a. 0
b. 1
c. 2
d. 3
e. 4

Answer 8

c. 2