Q: Which equation correctly represents the relationship between blood flow, pressure difference, and resistance?

$$\text{Flow} (Q) = \dfrac{\text{Pressure difference} (\Delta P)}{\text{Resistance} (R)}$$

Q: A patient’s cardiac output is measured at 5 L/min. If their heart rate is 100 beats/min, what is their stroke volume?

$$\text{Stroke volume} = 50 mL$$

Question 1

Which of the following best describes the function of the atria in the heart?

Accepted Answer

They receive blood returning to the heart from the body and lungs.

Question 2

According to the Frank-Starling law, what happens when the volume of blood in the heart before contraction increases?

Accepted Answer

The heart contracts with greater force.

Question 3

Which equation correctly represents the relationship between blood flow, pressure difference, and resistance?

Accepted Answer

$$	ext{Flow} (Q) = \dfrac{	ext{Pressure difference} (\Delta P)}{	ext{Resistance} (R)}$$

Question 4

A patient has a pressure difference ($$\Delta P) of 80 $$mmHg and a vascular resistance ($$R) of 20 $$units. What is the blood flow ($$Q) in $$this vessel?

Accepted Answer

$$Q = 4$$ units

Question 5

Which of the following would most likely increase vascular resistance?

Accepted Answer

Decreasing the radius of the blood vessel

Question 6

What is the primary reason blood flows from the heart to the tissues?

Accepted Answer

Because blood moves from areas of high pressure to low pressure

Question 7

Which of the following statements about hydrostatic pressure is correct?

Accepted Answer

It is the pressure exerted by a fluid at rest, equally in all directions.

Question 8

If the cross-sectional area of a blood vessel decreases while the flow rate remains constant, what happens to the velocity of blood flow?

Accepted Answer

Velocity increases

Question 9

Which part of the heart receives deoxygenated blood from the body?

Accepted Answer

Right atrium

Question 10

A patient’s cardiac output is measured at 5 L/min. If their heart rate is 100 beats/min, what is their stroke volume?

Accepted Answer

$$	ext{Stroke volume} = 50 mL$$

Question 11

Which of the following is a direct effect of increased friction as blood moves through vessels?

Accepted Answer

Decreased pressure along the vessel’s length

Question 12

Which of the following best explains why arteries have higher pressure than veins?

Accepted Answer

Arteries are closer to the heart and receive blood directly from ventricular contraction.

Question 13

If a patient’s blood pressure is measured as 120/80 mmHg, what does the 120 mmHg value represent?

Accepted Answer

Systolic pressure

Question 14

Which of the following would most likely result in tachycardia?

Accepted Answer

An increase in heart rate above normal

Question 15

Which of the following is true regarding the cardiac cycle?

Accepted Answer

It includes all events associated with blood flow during a single heartbeat.

Question 16

Which of the following is the correct formula for cardiac output?

Accepted Answer

$$	ext{Cardiac Output} = 	ext{Stroke Volume} 	imes 	ext{Heart Rate}$$

Question 17

Which of the following would most likely cause a decrease in blood flow through an organ?

Accepted Answer

A decrease in the pressure gradient

Question 18

Which of the following is a consequence of the one-way flow created by heart valves?

Accepted Answer

Blood is prevented from flowing backward, ensuring efficient circulation.

Question 19

If the pressure at the beginning of a vessel is 100 mmHg and at the end is 40 mmHg, what is the pressure gradient ($$\Delta P$$)?

Accepted Answer

$$\Delta P = 60$$ mmHg

Question 20

Which of the following best describes the role of the ventricles in the heart?

Accepted Answer

They pump blood out to the lungs and body.

Cardiovascular System: Structure, Function, and Hemodynamics

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