Q: Which equation correctly represents the calculation of mean arterial pressure (MAP)?

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

Question 1

Which of the following best describes the function of arteries in the cardiovascular system?

Accepted Answer

They serve as a pressure reservoir that maintains blood flow during ventricular relaxation.

Question 2

A patient stands up quickly and experiences dizziness. Which physiological mechanism is primarily responsible for compensating this change in blood pressure?

Accepted Answer

Baroreceptor reflex in the carotid arteries and aorta

Question 3

Which equation correctly represents the calculation of mean arterial pressure (MAP)?

Accepted Answer

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

Question 4

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

Accepted Answer

Decreased radius of arterioles

Question 5

A drug that blocks alpha ($$\alpha) $$adrenergic receptors would have which of the following effects on blood vessels?

Accepted Answer

It would cause vasodilation in most systemic arterioles.

Question 6

Which of the following statements about capillaries is TRUE?

Accepted Answer

Capillaries are the primary site for nutrient and gas exchange between blood and tissues.

Question 7

Bulk flow across capillary walls is determined by the balance of which two pressures?

Accepted Answer

Hydrostatic pressure and colloid osmotic pressure

Question 8

Which of the following best explains why velocity of blood flow is lowest in the capillaries?

Accepted Answer

Capillaries have the highest total cross-sectional area.

Question 9

A patient with liver failure develops edema. Which of the following best explains this phenomenon?

Accepted Answer

Decreased plasma protein concentration reduces capillary colloid osmotic pressure

Question 10

Which of the following is a function of the lymphatic system?

Accepted Answer

It returns filtered fluid and proteins to the circulatory system.

Question 11

Which of the following is a controllable risk factor for cardiovascular disease?

Accepted Answer

Obesity

Question 12

A patient is diagnosed with primary (essential) hypertension. Which of the following is most likely TRUE about this condition?

Accepted Answer

It is associated with increased peripheral resistance despite normal cardiac output.

Question 13

Which of the following cytokines promotes angiogenesis?

Accepted Answer

Vascular endothelial growth factor (VEGF)

Question 14

If the radius of an arteriole is halved, what happens to the resistance to blood flow, assuming all other factors remain constant? (Recall Poiseuille's Law: $$R \propto \frac{1}{r^4$})$$

Accepted Answer

Resistance increases by a factor of 16

Question 15

Which of the following best describes the role of pericytes in capillaries?

Accepted Answer

They secrete paracrine factors that promote vascular growth and differentiation.

Question 16

During ventricular relaxation, how do arteries maintain blood flow to the tissues?

Accepted Answer

By elastic recoil, which maintains driving pressure

Question 17

Which of the following would most likely result in an increase in mean arterial pressure (MAP)?

Accepted Answer

Increased cardiac output and increased peripheral resistance

Question 18

Which of the following is the primary determinant of the velocity of blood flow in a vessel, assuming constant flow rate?

Accepted Answer

The total cross-sectional area of the vessel(s)

Question 19

Which of the following best explains why veins are called the 'volume reservoir' of the circulatory system?

Accepted Answer

They contain the majority of the blood volume at any given time.

Question 20

A patient with untreated hypertension is at increased risk for which of the following complications?

Accepted Answer

Pulmonary edema and congestive heart failure

Blood Flow and the Control of Blood Pressure

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