Question 1

Which of the following best describes the function of elastic (conducting) arteries in the cardiovascular system?

Accepted Answer

They act as pressure reservoirs, expanding and recoiling as blood is ejected from the heart.

Question 2

Which structural feature is unique to veins and helps maintain unidirectional blood flow toward the heart, especially in the limbs?

Accepted Answer

Valves

Question 3

A patient presents with a blood pressure of 120/80 mmHg. Calculate the mean arterial pressure (MAP) using the formula $$MAP = 	ext{diastolic pressure} + \frac{1}{3}(	ext{systolic pressure} - 	ext{diastolic pressure}). $$What is the MAP?

Accepted Answer

$$93$$ mmHg

Question 4

Which type of capillary is most permeable and found in the liver, bone marrow, and spleen?

Accepted Answer

Sinusoidal capillaries

Question 5

If the radius of a blood vessel is doubled, how does the resistance to blood flow change, according to the relationship $$R \propto \frac{1}{r^4$}$$?

Accepted Answer

Resistance decreases to $$\frac{1}{16} of $$its original value.

Question 6

Which of the following mechanisms is primarily responsible for the short-term regulation of blood pressure?

Accepted Answer

Neural and hormonal controls altering peripheral resistance and cardiac output

Question 7

A patient with chronic hypertension has baroreceptors that are 'reprogrammed.' What is the physiological consequence of this adaptation?

Accepted Answer

Baroreceptors become less sensitive to elevated blood pressure, maintaining a higher set point.

Question 8

Which of the following best explains why capillary blood pressure is low (35–15 mmHg) compared to arterial pressure?

Accepted Answer

High pressure would rupture fragile capillaries and low pressure allows for effective exchange of substances.

Question 9

Which hormone causes a decrease in blood volume and blood pressure by promoting vasodilation and increased sodium excretion?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 10

A patient is experiencing circulatory shock due to massive blood loss. Which type of shock is this, and what is the primary physiological problem?

Accepted Answer

Hypovolemic shock; inadequate blood volume to maintain circulation

Question 11

Which of the following is the correct formula for Net Filtration Pressure (NFP) at a capillary bed?

Accepted Answer

$$NFP = (HP_c - HP_{if}) - (OP_c - OP_{if})$$

Question 12

Which of the following best describes the role of precapillary sphincters in capillary beds?

Accepted Answer

They regulate blood flow into true capillaries based on local chemical conditions.

Question 13

Which of the following is a major determinant of peripheral resistance in the systemic circulation?

Accepted Answer

Arteriolar diameter

Question 14

Which of the following statements about blood flow velocity is correct?

Accepted Answer

Blood flow velocity is slowest in the capillaries due to their large total cross-sectional area.

Question 15

Which of the following is a direct effect of sympathetic stimulation on blood vessels?

Accepted Answer

Vasoconstriction of most arterioles via alpha-1 adrenergic receptors

Question 16

A patient with Addison’s disease is likely to experience which blood pressure abnormality, and why?

Accepted Answer

Chronic hypotension due to inadequate adrenal cortex function

Question 17

Which of the following best explains why blood flow to the brain remains relatively constant despite changes in systemic blood pressure?

Accepted Answer

Metabolic and myogenic autoregulation mechanisms adjust cerebral vessel diameter.

Question 18

Which of the following is a consequence of increased capillary hydrostatic pressure at the venous end of a capillary bed?

Accepted Answer

Edema due to excess fluid leaving the capillaries into the interstitial space

Question 19

Which of the following is true regarding the pulmonary circuit’s autoregulation compared to systemic tissues?

Accepted Answer

Low O$$_2 in $$pulmonary tissues causes vasoconstriction, directing blood to better-ventilated areas.

Question 20

Which of the following is the correct relationship between blood flow (F), pressure gradient ($$\Delta P$$), and resistance (R)?

Accepted Answer

$$F = \frac{\Delta P}{R}$$

Study Guide: The Cardiovascular System – Blood Vessels

Study Guide - Practice Questions

Study Guide - Flashcards