Q: Which of the following is the correct formula for mean arterial pressure (MAP)?

$$MAP = \text{diastolic pressure} + \frac{1}{3}(\text{systolic pressure} - \text{diastolic pressure})$$

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 prevent the backflow of blood, especially in the limbs?

Accepted Answer

Valves

Question 3

A patient has a blood vessel with a lumen diameter of 9.0 μm and a wall thickness of 0.5 μm. Which vessel type is this most likely to be?

Accepted Answer

Capillary

Question 4

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

Accepted Answer

Sinusoidal capillary

Question 5

If the radius of a blood vessel is doubled, what happens to the resistance to blood flow, according to Poiseuille's law?

Accepted Answer

Resistance decreases to 1/16 of its original value: $$R \propto \frac{1}{r^4$}$$

Question 6

Which of the following is the correct formula for mean arterial pressure (MAP)?

Accepted Answer

$$MAP = 	ext{diastolic pressure} + \frac{1}{3}(	ext{systolic pressure} - 	ext{diastolic pressure})$$

Question 7

Which vessel type is primarily responsible for regulating peripheral resistance and thus blood pressure?

Accepted Answer

Arterioles

Question 8

A patient with chronic hypertension is found to have increased blood viscosity. How does this affect peripheral resistance and blood pressure?

Accepted Answer

Increased viscosity increases peripheral resistance, which raises blood pressure.

Question 9

Which of the following mechanisms is NOT a factor aiding venous return to the heart?

Accepted Answer

Elastic recoil of arteries

Question 10

During exercise, which of the following changes would you expect in the cardiovascular system?

Accepted Answer

Increased cardiac output and increased mean arterial pressure

Question 11

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

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 12

A patient has a blood pressure of 120/80 mm Hg. What is the pulse pressure and mean arterial pressure (MAP)?

Accepted Answer

Pulse pressure = 40 mm Hg; MAP = 93 mm Hg

Question 13

Which of the following best explains why capillary blood pressure is much lower than arterial blood pressure?

Accepted Answer

High pressure would rupture fragile capillary walls and low pressure is sufficient for exchange.

Question 14

Which of the following is a direct effect of angiotensin II in the regulation of blood pressure?

Accepted Answer

Vasoconstriction, leading to increased blood pressure

Question 15

Which of the following statements about the relationship between blood flow, pressure, and resistance is correct?

Accepted Answer

$$F = \frac{\Delta P}{R}$$, so blood flow increases as pressure gradient increases or resistance decreases.

Question 16

Which of the following best describes the role of baroreceptors in blood pressure regulation?

Accepted Answer

They detect changes in arterial pressure and initiate reflexes to maintain homeostasis.

Question 17

A patient is experiencing severe blood loss. Which hormone is most likely to be released to cause intense vasoconstriction and help maintain blood pressure?

Accepted Answer

Antidiuretic hormone (ADH)

Question 18

Which of the following is a characteristic of continuous capillaries?

Accepted Answer

They have tight junctions with intercellular clefts that allow passage of fluids and small solutes.

Question 19

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

Accepted Answer

They contain up to 65% of the blood supply and can accommodate large changes in blood volume.

Question 20

Which of the following is a real-life example of an arterial anastomosis providing collateral circulation?

Accepted Answer

The circle of Willis in the brain, which provides alternate routes for blood flow if one artery is blocked.

Study Guide: The Cardiovascular System – Blood Vessels

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드