Q: A patient with bradycardia has a heart rate of 50 beats per minute and a stroke volume of 70 mL. What is their cardiac output?

$CO = 50 \times 70 = 3500$ mL/min

Question 1

Which of the following best describes the primary function of leukocytes under normal homeostatic conditions?

Accepted Answer

Defend the body against infectious agents and foreign substances

Question 2

A patient presents with anemia. Which of the following is the most likely direct consequence of this condition?

Accepted Answer

Reduced oxygen-carrying capacity of the blood

Question 3

Which formula correctly calculates cardiac output ($CO$) in terms of stroke volume ($SV$) and heart rate ($HR$)?

Accepted Answer

$CO = SV 	imes HR$

Question 4

During exercise, which change is most likely to occur in the cardiovascular system?

Accepted Answer

Increase in cardiac output

Question 5

Which of the following best explains the effect of increased vessel diameter on blood flow resistance, according to Poiseuille’s Law?

Accepted Answer

Resistance decreases as diameter increases

Question 6

A patient has a blood pressure reading of 120/80 mmHg. What is the pulse pressure?

Accepted Answer

$120 - 80 = 40$ mmHg

Question 7

Which of the following is a correct sequence for the electrical conduction system of the heart?

Accepted Answer

SA node → AV node → Bundle of His → Purkinje fibers

Question 8

Which of the following best describes the role of chemoreceptors in cardiovascular regulation?

Accepted Answer

Monitor blood oxygen, carbon dioxide, and pH levels

Question 9

Which of the following is a major difference between arteries and veins?

Accepted Answer

Arteries have thicker muscular walls than veins

Question 10

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

Accepted Answer

$MAP = CO 	imes TPR$

Question 11

A patient with bradycardia has a heart rate of 50 beats per minute and a stroke volume of 70 mL. What is their cardiac output?

Accepted Answer

$CO = 50 	imes 70 = 3500$ mL/min

Question 12

Which of the following would most likely increase total peripheral resistance (TPR)?

Accepted Answer

Vasoconstriction of arterioles

Question 13

Which of the following best explains how skeletal muscles assist the cardiovascular system during exercise?

Accepted Answer

They facilitate venous return through the muscle pump mechanism

Question 14

Which of the following is the correct definition of osmosis?

Accepted Answer

Movement of water across a semipermeable membrane from low to high solute concentration

Question 15

Which of the following factors would most likely decrease cardiac output?

Accepted Answer

Decreased heart rate

Question 16

Which of the following is a function of hemoglobin in red blood cells?

Accepted Answer

Transports oxygen from the lungs to tissues

Question 17

Which of the following best describes the effect of baroreceptors on blood pressure regulation?

Accepted Answer

They sense changes in blood pressure and initiate reflexes to maintain homeostasis

Question 18

Which of the following statements about fetal circulation is correct?

Accepted Answer

The ductus arteriosus connects the pulmonary artery to the aorta

Question 19

Which of the following would most likely result from increased resistance in systemic arterioles?

Accepted Answer

Increased mean arterial pressure

Question 20

Which of the following best explains why action potentials in cardiac muscle differ from those in skeletal muscle?

Accepted Answer

Cardiac muscle action potentials have a prolonged plateau phase due to calcium influx

Cardiovascular System: Blood, Heart, and Circulation Study Notes

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