Question 1

Which of the following factors would most directly increase mean arterial blood pressure (MAP) according to the equation $$MAP = CO 	imes TPR$$?

Accepted Answer

An increase in total peripheral resistance (TPR)

Question 2

A patient experiences a sudden drop in blood pressure upon standing (orthostatic hypotension). Which physiological response is most likely to occur as a result of the baroreceptor reflex?

Accepted Answer

Increased heart rate and vasoconstriction

Question 3

Which of the following best explains why blood flow to the brain remains relatively constant even during heavy exercise?

Accepted Answer

Blood flow to the brain is primarily regulated by local metabolic factors

Question 4

If the net pressure at the arterial end of a capillary is calculated as $$Net\ P_A = P_{H_A} - \pi = 32 - 25 = 7\ mm\ Hg$$, what does this value indicate?

Accepted Answer

There is net filtration of fluid out of the capillary

Question 5

Which of the following is NOT a function of the lymphatic vascular system?

Accepted Answer

Regulation of arterial blood pressure

Question 6

A patient with liver failure develops edema. Which mechanism best explains this phenomenon?

Accepted Answer

Decreased plasma protein concentration

Question 7

Which of the following would most likely result in increased filtration at the capillary beds?

Accepted Answer

Increased capillary hydrostatic pressure

Question 8

Which of the following statements about the baroreceptor reflex is correct?

Accepted Answer

Baroreceptors increase their firing rate when blood pressure increases

Question 9

A patient with a parasitic infection blocking lymphatic vessels develops severe swelling in one limb. What is the most likely diagnosis?

Accepted Answer

Lymphedema

Question 10

Which of the following best describes the effect of sympathetic stimulation on arterioles?

Accepted Answer

It causes vasoconstriction and increases resistance

Question 11

Which of the following is a direct consequence of increased capillary permeability during inflammation?

Accepted Answer

Increased interstitial protein concentration

Question 12

Which of the following best explains why a person with a genetic defect preventing lymphatic lipid uptake is resistant to diet-induced obesity?

Accepted Answer

They cannot absorb dietary lipids from the gastrointestinal tract

Question 13

Which of the following is the primary mechanism by which lymph is propelled through lymphatic vessels?

Accepted Answer

Skeletal muscle contraction and lymphatic valves

Question 14

Which of the following would most likely occur if the baroreceptors in the carotid sinus were destroyed?

Accepted Answer

Blood pressure would become more variable and less well regulated

Question 15

Which of the following best describes the blood-oxygen-level-dependent (BOLD) response measured by fMRI?

Accepted Answer

It detects changes in oxygen levels in the blood as a proxy for neural activity

Question 16

A patient with heart failure develops pulmonary edema. Which of the following best explains the underlying mechanism?

Accepted Answer

Increased hydrostatic pressure in the pulmonary capillaries

Question 17

Which of the following is a major function of pericytes in the microcirculation?

Accepted Answer

They support capillary stability and regulate blood flow

Question 18

Which of the following would most likely increase the risk of peripheral edema?

Accepted Answer

Increased capillary hydrostatic pressure

Question 19

Which of the following best describes the path of blood flow to the brain?

Accepted Answer

From the heart through the internal carotid and vertebral arteries to the Circle of Willis

Question 20

Which of the following is a likely outcome if the lymphatic system fails to return extravasated fluid to the venous circulation?

Accepted Answer

Edema formation

Microcirculation, Blood Pressure Regulation, and the Lymphatic System

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