Question 1

Which of the following best describes the effect of vessel radius on blood flow according to Poiseuille’s Law?

Accepted Answer

Blood flow is directly proportional to the fourth power of the vessel radius.

Question 2

A patient presents with edema. Which of the following is NOT a factor that can disrupt the normal balance between capillary filtration and absorption?

Accepted Answer

Increased lymphatic drainage

Question 3

During ventricular systole, which event occurs in the cardiac cycle?

Accepted Answer

Semilunar valves open and blood is ejected into the arteries

Question 4

Which equation correctly represents cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 5

A patient’s mean arterial pressure ($$MAP) is $$found to be elevated. Which of the following could directly cause this increase?

Accepted Answer

Increased blood volume

Question 6

Which of the following statements about the action potential in cardiac contractile cells is TRUE?

Accepted Answer

The plateau phase is caused by calcium influx and potassium efflux.

Question 7

Which formula best describes the relationship between resistance ($$R) $$and vessel radius ($$r) in $$blood flow?

Accepted Answer

$$R \propto \frac{1}{r^4$}$$

Question 8

Which of the following is a function of albumin, a plasma protein?

Accepted Answer

Maintains colloid osmotic pressure

Question 9

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

Accepted Answer

Capillaries have the largest total cross-sectional area

Question 10

Which of the following is TRUE regarding the baroreceptor reflex?

Accepted Answer

It decreases heart rate in response to high blood pressure

Question 11

Which of the following is the correct definition of stroke volume ($$SV$$)?

Accepted Answer

$$SV = EDV - ESV$$

Question 12

Which of the following is a primary function of the respiratory system?

Accepted Answer

Exchange of gases between the atmosphere and blood

Question 13

According to Boyle’s Law, what happens to the pressure of a gas if the volume of its container decreases?

Accepted Answer

Pressure increases

Question 14

Which of the following is TRUE about the Frank-Starling Law of the Heart?

Accepted Answer

Stroke volume increases as end-diastolic volume increases

Question 15

Which of the following best describes the effect of sympathetic stimulation on vascular smooth muscle?

Accepted Answer

It causes vasoconstriction in most blood vessels

Question 16

Which of the following is a correct application of Dalton’s Law in the respiratory system?

Accepted Answer

The total pressure of a gas mixture is equal to the sum of the partial pressures of each gas

Question 17

Which of the following is TRUE regarding the difference between cardiac autorhythmic cells and contractile cells?

Accepted Answer

Autorhythmic cells generate action potentials spontaneously

Question 18

Which of the following is a correct definition of tidal volume ($$TV$$)?

Accepted Answer

The volume of air moved in and out of the lungs during quiet breathing

Question 19

Which of the following best describes the mechanism of capillary exchange by bulk flow?

Accepted Answer

Movement of fluid driven by pressure gradients

Question 20

A patient with increased blood viscosity is likely to experience which of the following changes in blood flow?

Accepted Answer

Increased resistance and decreased flow

Comprehensive Study Guide: Cardiovascular, Blood, and Respiratory Physiology

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