Question 1

Which layer of blood vessel walls is primarily responsible for secreting paracrine factors that regulate blood pressure and vessel growth?

Accepted Answer

Endothelium

Question 2

Arteries act as a pressure reservoir in the cardiovascular system. What structural feature allows them to perform this function?

Accepted Answer

Thick layers of vascular smooth muscle and abundant elastic tissue

Question 3

Which of the following is the primary site of variable resistance in the circulatory system?

Accepted Answer

Arterioles

Question 4

What happens to mean arterial pressure (MAP) when an arteriole constricts?

Accepted Answer

MAP increases

Question 5

Which formula correctly calculates mean arterial pressure (MAP)?

Accepted Answer

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

Question 6

A patient has a systolic pressure of 130 mmHg and a diastolic pressure of 80 mmHg. What is their mean arterial pressure (MAP)?

Accepted Answer

$$MAP = 80 + \frac{1}{3}(130 - 80) = 80 + \frac{1}{3}(50) = 80 + 16.67 = 96.67$$ mmHg

Question 7

Which of the following mechanisms does NOT aid venous return to the heart?

Accepted Answer

Decrease in heart rate

Question 8

If blood volume decreases significantly, which compensatory mechanism is LEAST likely to help restore blood pressure?

Accepted Answer

Decreased cardiac output

Question 9

Which of the following is a risk factor for cardiovascular disease that cannot be modified by lifestyle changes?

Accepted Answer

Family history

Question 10

Atherosclerosis is best described as:

Accepted Answer

An inflammatory process involving cholesterol and triglyceride accumulation in vessel walls

Question 11

Which type of cholesterol is considered 'healthy' and protective against cardiovascular disease?

Accepted Answer

High-density lipoprotein cholesterol (HDL-C)

Question 12

Which of the following drugs is used to treat hypertension by reducing heart rate and force of contraction?

Accepted Answer

Beta-blockers

Question 13

Which equation best represents the relationship between mean arterial pressure (MAP), cardiac output (CO), and total peripheral resistance (R)?

Accepted Answer

$$MAP = CO 	imes R$$

Question 14

A patient stands up quickly from a supine position and experiences dizziness. Which physiological reflex is responsible for compensating this change?

Accepted Answer

Baroreceptor reflex

Question 15

Which of the following is TRUE regarding capillaries?

Accepted Answer

They are the primary site of exchange between blood and interstitial fluid

Question 16

Which factor does NOT directly affect vascular resistance according to Poiseuille's law?

Accepted Answer

Blood pressure

Question 17

Which of the following statements about veins is CORRECT?

Accepted Answer

Veins contain one-way valves to prevent backflow

Question 18

Which neurotransmitter is primarily responsible for maintaining arteriolar tone via sympathetic innervation?

Accepted Answer

Norepinephrine

Question 19

Which of the following conditions is most likely to result from a mean arterial pressure (MAP) below 60 mmHg?

Accepted Answer

Tissue damage due to inadequate blood flow

Question 20

Which of the following is a characteristic of primary (essential) hypertension?

Accepted Answer

It is associated with increased peripheral resistance

Blood Flow and the Control of Blood Pressure: Structure and Function of Blood Vessels

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