Question 1

Which of the following would most likely increase mean arterial resistance in a patient experiencing acute blood loss?

Accepted Answer

Activation of the renin-angiotensin-aldosterone system leading to vasoconstriction

Question 2

A patient is given a drug that increases the number of circulating red blood cells. Which equation best describes the effect on blood viscosity ($$\eta) $$and its impact on resistance ($$R) in a $$vessel of constant radius ($$r) $$and length ($$L$$)?

Accepted Answer

$$R = \dfrac{8 \eta L}{\pi r^4$}$$; increasing $$\eta$$ increases $$R$$

Question 3

Which hormone is most directly responsible for increasing blood volume by promoting sodium and water retention in the kidneys?

Accepted Answer

Aldosterone

Question 4

During vigorous exercise, which physiological change is most likely to occur to maintain adequate tissue perfusion?

Accepted Answer

Increased stroke volume and vasodilation in skeletal muscle arterioles

Question 5

A patient with chronic hypertension is found to have increased arteriolar resistance. Which of the following mechanisms is most likely contributing to this condition?

Accepted Answer

Enhanced sympathetic nervous system activity

Question 6

If a person experiences a sudden drop in blood pressure, which compensatory mechanism is most likely to be activated first?

Accepted Answer

Activation of the sympathetic nervous system to increase heart rate and vasoconstriction

Question 7

Which of the following best explains why vasopressin (antidiuretic hormone) increases mean arterial pressure?

Accepted Answer

It promotes water reabsorption, increasing blood volume

Question 8

A patient with severe dehydration is likely to have which of the following changes in blood parameters?

Accepted Answer

Increased blood viscosity and increased mean arterial resistance

Question 9

Which of the following equations correctly relates cardiac output ($$CO$$), heart rate ($$HR$$), and stroke volume ($$SV$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 10

A patient is administered a vasodilator that doubles the arteriolar radius. By what factor does the resistance to blood flow change, assuming all other variables remain constant? (Use $$R = \dfrac{8 \eta L}{\pi r^4$})$$

Accepted Answer

Resistance decreases by a factor of 16

Question 11

Which of the following would most likely result from increased venous return to the heart?

Accepted Answer

Increased cardiac output

Question 12

A patient with a genetic mutation causing reduced responsiveness to angiotensin II would most likely exhibit which of the following?

Accepted Answer

Decreased arteriolar resistance and lower blood pressure

Question 13

Which of the following is a direct effect of increased sympathetic nervous system activity on the cardiovascular system?

Accepted Answer

Increased cardiac contractility and vasoconstriction

Question 14

A patient with polycythemia (elevated red blood cell count) is at increased risk for which of the following complications?

Accepted Answer

Increased blood viscosity and hypertension

Question 15

Which of the following best describes the role of passive bulk-flow fluid shifts in maintaining blood pressure?

Accepted Answer

They move fluid between vascular and interstitial compartments to stabilize blood volume

Question 16

A patient with heart failure has a reduced stroke volume. Which of the following compensatory mechanisms is most likely to be activated to maintain cardiac output?

Accepted Answer

Increased heart rate

Question 17

Which of the following would most likely occur if arteriolar radius decreases by half, assuming all other factors remain constant? (Use $$R = \dfrac{8 \eta L}{\pi r^4$})$$

Accepted Answer

Resistance increases by a factor of 16

Question 18

Which of the following is most likely to occur during activation of the renin-angiotensin-aldosterone system?

Accepted Answer

Increased vasoconstriction and elevated mean arterial pressure

Question 19

A patient with severe anemia has a reduced number of red blood cells. Which of the following changes is most likely to occur in their blood flow dynamics?

Accepted Answer

Decreased blood viscosity and decreased resistance

Question 20

Which of the following is a direct effect of epinephrine released during the 'fight or flight' response?

Accepted Answer

Increased heart rate and vasodilation in skeletal muscle

Cardiovascular Physiology: Regulation of Blood Pressure and Blood Flow

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