Question 1

Which of the following correctly lists the three tunics of blood vessels from superficial to deep, and their primary tissue composition?

Accepted Answer

Tunica externa (connective tissue), tunica media (smooth muscle), tunica intima (endothelium)

Question 2

Which type of blood vessel has the thickest tunica media and why is this significant for its function?

Accepted Answer

Muscular arteries; because they regulate blood flow by vasoconstriction and vasodilation

Question 3

How are blood flow ($$F) $$and the pressure gradient ($$\Delta P) $$related according to the equation for blood flow?

Accepted Answer

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

Question 4

Which of the following best describes the relationship between blood flow and resistance ($$R$$)?

Accepted Answer

Blood flow decreases as resistance increases

Question 5

Which of the following is NOT one of the three main factors that determine blood pressure?

Accepted Answer

Blood viscosity

Question 6

If the diameter of a blood vessel doubles, what happens to the peripheral resistance, assuming all other factors remain constant?

Accepted Answer

It decreases by a factor of 16

Question 7

Calculate the Mean Arterial Pressure (MAP) if a patient has a systolic blood pressure of 120 mmHg and a diastolic blood pressure of 80 mmHg.

Accepted Answer

$$MAP = 80 + \frac{1}{3}(120 - 80) = 93.3$$ mmHg

Question 8

What effect does sympathetic nervous system activation have on blood pressure?

Accepted Answer

It increases heart rate and causes vasoconstriction, raising blood pressure

Question 9

Which type of capillary is most permeable and where is it commonly found?

Accepted Answer

Sinusoidal capillary; found in the liver

Question 10

When blood pressure increases, what is the response of arterioles and tissue perfusion via the myogenic mechanism?

Accepted Answer

Arterioles constrict to reduce blood flow and maintain constant perfusion

Question 11

What is hydrostatic pressure, and how does it differ at the arterial and venous ends of a capillary?

Accepted Answer

Hydrostatic pressure is the pressure exerted by blood on capillary walls; it is higher at the arterial end

Question 12

In which direction does the hydrostatic pressure gradient drive the movement of water in a capillary?

Accepted Answer

From the capillary into the interstitial fluid

Question 13

What is colloid osmotic pressure, and in which direction does water move when an osmotic gradient is present?

Accepted Answer

It is the pressure exerted by plasma proteins; water moves into the capillary

Question 14

Which of the following best describes the direction of systemic blood flow?

Accepted Answer

From the left ventricle through the body and back to the right atrium

Question 15

A patient has a blood pressure of 140/90 mmHg. Calculate their pulse pressure and mean arterial pressure (MAP).

Accepted Answer

Pulse pressure = 50 mmHg; MAP = 106.7 mmHg

Question 16

Which of the following scenarios would most likely increase peripheral resistance and thus raise blood pressure?

Accepted Answer

Vasoconstriction of arterioles

Question 17

Which of the following best explains why veins have valves but arteries do not?

Accepted Answer

Valves in veins prevent backflow due to low pressure

Question 18

A patient experiences a sudden drop in blood volume due to hemorrhage. Which of the following is the most immediate effect on blood pressure?

Accepted Answer

Blood pressure decreases due to reduced cardiac output

Question 19

Which of the following best describes the effect of the parasympathetic nervous system on blood pressure?

Accepted Answer

It decreases heart rate and lowers blood pressure

Question 20

Which of the following capillary types would you expect to find in the kidneys, and what is their primary function?

Accepted Answer

Fenestrated capillaries; rapid filtration of blood plasma

Chapter 18: Blood Vessels and Hemodynamics Study Guide

Study Guide - Practice Questions