Quiz 2 2024

Question 1

Which vascular bed has the highest cross-sectional areas?

Answer 1

Capillaries

Question 2

Which tissue receives the greatest percentage of cardiac output during resting conditions?

Answer 2

Brain

Question 3

In which vessels does control of blood flow mainly occur?

Answer 3

Arterioles

Question 4

What terms accurately describe a sudden decrease in conduction velocity of the heart?
a. positive
b. dromotropy
c. lusitropy
d. chronotropy
e. negative

Answer 4

b and e

Question 5

What happens to resistance in a blood vessel as radius of the vessel increases?

Answer 5

decreases

Question 6

Systolic arterial blood pressure = 120 mmHg
Diastolic arterial blood pressure = 75 mmHg
HR = 85 bpm
What is the MAP?

Answer 6

90 mmHg

Question 7

End-diastolic volume = 35 mL
End-systolic volume = 19 mL
HR = 70 bpm
What is the cardiac output?

Answer 7

1.12 L/min

Question 8

A 440kg horse has an end-diastolic volume of 740 mL and a stroke volume of 520 mL. What is the ejection fraction?

Answer 8

0.7

Question 9

A 20 kg lamb has an end-diastolic volume = 45 mL, end-systolic volume = 12 mL and HR = 90 bpm. What is the stroke volume?

Answer 9

33 mL

Question 10

What is the HR if the RR interval is 325msec?

Answer 10

185 bpm

Question 11

Which ion is responsible for the upstroke in Phase 0 of a cardiac action potential?

Answer 11

Na+

Question 12

What type of receptor is primarily responsible for vasoconstriction of arteries and veins?

Answer 12

Aplha-1 adrenergic receptor

Question 13

T/F: During the effective refractory period, a stimulus may locally excite the tissue, but conduction of an aciton potential can’t occur - some Na+ channels are starting to open during this period.

Answer 13

True

Question 14

Which type of blood vessel holds the unstressed volume?

Answer 14

Veins

Question 15

T/F: As HR increases, intracellular Ca concentrations increase due to more Ca entering cell and more AP’s per unit time.

Answer 15

True

Question 16

Besides the increase in pressure, what other events occur during isovolumetric contraction of the left ventricle?

Answer 16

Volume remains constant and Valves are closed

Question 17

What heart sound is associated with atrial contraction?

Answer 17

4th

Question 18

What portion of the ECG represents depolarization of the atria?

Answer 18

P wave

Question 19

In a normal, healthy animal, what is the primary force causing fluid movement (filtration), out of the capillaries?

Answer 19

Capillary hydrostatic pressure

Question 20

Which circulations utilize local metabolic control as the most important control mechanism?

Answer 20

Coronary, pulmonary, renal, cerebral

Question 21

Which factor would be most likely to cause fluid to move OUT of capillaries and INTO tissues?

Answer 21

High interstitial oncotic pressure

Question 22

When blood volume increases, what will atrial natriuretic peptide do?

Answer 22

Decrease total peripheral resistance, increase Na and water excretion, and vasodilation