Question 1

Which of the following best describes the structural difference between arteries and veins?

Accepted Answer

Arteries have thicker tunica media and smaller lumens compared to veins.

Question 2

Which mechanism is NOT involved in aiding venous return to the heart?

Accepted Answer

High arterial pressure directly pushes blood through veins.

Question 3

Which type of capillary is most commonly found in the brain and why?

Accepted Answer

Continuous capillaries, because they have tight junctions limiting permeability.

Question 4

Which equation correctly relates blood flow ($$F$$), blood pressure ($$\Delta P$$), and peripheral resistance ($$R$$)?

Accepted Answer

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

Question 5

A patient has a systolic pressure of 140 mmHg and a diastolic pressure of 90 mmHg. What is the mean arterial pressure (MAP)?

Accepted Answer

$$MAP = 90 + \frac{1}{3}(140 - 90) = 106.7$$ mmHg

Question 6

Which hormone increases blood pressure by causing vasoconstriction and stimulating aldosterone release?

Accepted Answer

Angiotensin II

Question 7

If blood viscosity increases, what is the expected effect on peripheral resistance and blood pressure?

Accepted Answer

Peripheral resistance increases, blood pressure increases.

Question 8

Which of the following best describes the function of precapillary sphincters?

Accepted Answer

They regulate blood flow into capillary beds by opening or closing in response to local conditions.

Question 9

A patient with chronic hypertension is likely to have increased vasomotor tone. What does vasomotor tone refer to?

Accepted Answer

The baseline level of contraction in vascular smooth muscle regulated by sympathetic nerves.

Question 10

Which of the following is a direct mechanism by which the kidneys regulate blood pressure long-term?

Accepted Answer

Adjusting water reabsorption to control blood volume.

Question 11

Which scenario would most likely result in edema?

Accepted Answer

Increased net filtration pressure in capillaries and impaired lymphatic drainage.

Question 12

Which of the following best defines an anastomosis?

Accepted Answer

A direct connection between two blood vessels allowing alternative routes for blood flow.

Question 13

Which area of the body benefits most from collateral circulation?

Accepted Answer

The heart (coronary circulation), providing alternative routes during blockages.

Question 14

Which of the following statements about capillary exchange is correct?

Accepted Answer

Diffusion moves oxygen from blood to tissues, while osmosis moves water from tissues to blood.

Question 15

Which vessel type is most responsible for regulating systemic blood pressure through changes in diameter?

Accepted Answer

Arterioles

Question 16

Which of the following is a plausible consequence of decreased baroreceptor sensitivity?

Accepted Answer

Reduced ability to detect changes in blood pressure, leading to sustained hypertension.

Question 17

Which equation is used to calculate pulse pressure ($$PP) $$given systolic ($$SP) $$and diastolic ($$DP) $$pressures?

Accepted Answer

$$PP = SP - DP$$

Question 18

Which of the following best describes the effect of vasodilation on blood flow and blood pressure?

Accepted Answer

Vasodilation increases vessel diameter, decreases resistance, and increases blood flow.

Question 19

Which of the following is a characteristic of sinusoidal capillaries?

Accepted Answer

They have large gaps and are found in the liver and spleen, allowing passage of blood cells.

Question 20

A red blood cell travels from the right atrium to the left ventricle. Which sequence of vessels does it pass through?

Accepted Answer

Right atrium → right ventricle → pulmonary artery → pulmonary capillaries → pulmonary vein → left atrium → left ventricle

Blood Vessels: Structure, Function, and Regulation

Study Guide - Practice Questions