Question 1

Which of the following best describes the primary function of continuous capillaries, as shown in the provided diagram?

Accepted Answer

They are the least permeable and most common capillaries, primarily allowing passage of small solutes and water.

Question 2

A patient with severe liver disease develops widespread edema. Which of the following best explains this phenomenon using the concept of capillary exchange?

Accepted Answer

Decreased capillary colloid osmotic pressure due to low plasma proteins reduces reabsorption, increasing net filtration.

Question 3

Which equation correctly represents the relationship between blood flow (F), pressure gradient ($$\Delta P$$), and total peripheral resistance (TPR)?

Accepted Answer

$$F = \Delta P / TPR$$

Question 4

Which of the following changes would most effectively decrease total peripheral resistance (TPR) in the systemic circulation?

Accepted Answer

Doubling the radius of arterioles

Question 5

A patient stands up quickly and feels dizzy. Which physiological mechanism is most responsible for restoring blood pressure to normal in this situation?

Accepted Answer

Baroreceptor reflex increases sympathetic output, causing vasoconstriction and increased heart rate.

Question 6

Which of the following best describes the role of the muscular pump in venous return, as illustrated in the provided diagram?

Accepted Answer

It propels blood in veins toward the heart by skeletal muscle contraction, aided by venous valves.

Question 7

Which of the following is a unique feature of sinusoidal capillaries compared to continuous and fenestrated capillaries?

Accepted Answer

They have large intercellular clefts and incomplete basement membranes, allowing passage of large molecules and cells.

Question 8

During strenuous exercise, blood flow to skeletal muscles increases dramatically. Which mechanism is primarily responsible for this redistribution?

Accepted Answer

Intrinsic metabolic controls cause vasodilation of arterioles in active muscles.

Question 9

Which of the following best explains why velocity of blood flow is slowest in the capillaries?

Accepted Answer

Capillaries have the largest total cross-sectional area, causing blood flow to slow down.

Question 10

Which hormone decreases mean arterial pressure (MAP) by causing vasodilation and increased salt and water loss in the kidneys?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 11

A patient with chronic hypertension is at increased risk for which of the following complications?

Accepted Answer

Stroke due to rupture of fragile cerebral vessels

Question 12

Which of the following equations correctly calculates mean arterial pressure (MAP) using systolic pressure (SP) and diastolic pressure (DP)?

Accepted Answer

$$MAP = DP + \frac{1}{3}(SP - DP)$$

Question 13

Which of the following best describes the effect of angiotensin II on blood pressure regulation?

Accepted Answer

It stimulates vasoconstriction and increases aldosterone and ADH release, raising blood pressure.

Question 14

Which of the following is a direct effect of increased blood vessel length on total peripheral resistance (TPR)?

Accepted Answer

TPR increases because there is more friction between blood and vessel walls.

Question 15

Which of the following best explains why veins are called capacitance vessels?

Accepted Answer

They can accommodate large volumes of blood at low pressure, storing up to 65% of the blood supply.

Question 16

Which of the following is the correct formula for net filtration pressure (NFP) at a capillary bed?

Accepted Answer

$$NFP = (HP_{c} + OP_{if}) - (HP_{if} + OP_{c})$$

Question 17

Which of the following is a characteristic of the direct renal mechanism for long-term blood pressure regulation?

Accepted Answer

It alters blood volume independently of hormones by adjusting urine output.

Question 18

Which of the following best describes the difference between intrinsic and extrinsic controls of blood flow?

Accepted Answer

Intrinsic controls (autoregulation) act locally within tissues, while extrinsic controls involve nervous or hormonal regulation from outside the tissue.

Blood Vessel Structure, Function, and Circulatory Dynamics

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드