Q: A 50-year-old individual wants to exercise at 70% of their maximum heart rate. Using the formula $$\text{Max HR} = 220 - \text{age}$$, what is their target heart rate?

$$\text{Target HR} = 0.7 \times (220 - 50) = 0.7 \times 170 = 119$$ bpm

Question 1

Which of the following best describes the role of baroreceptors in regulating arterial blood pressure?

Accepted Answer

They detect changes in blood pressure and send signals to the cardiovascular center in the brain, which then adjusts heart rate and vascular resistance to restore normal blood pressure.

Question 2

During exercise, which physiological changes occur to ensure adequate blood flow to skeletal muscles?

Accepted Answer

Local vasodilation of arterioles and precapillary sphincters increases blood flow, and cardiac output is increased via baroreceptor-mediated reflexes.

Question 3

A patient presents with chest pain, tightness, and shortness of breath after climbing stairs. The symptoms resolve with rest. What is the most likely diagnosis?

Accepted Answer

Angina pectoris

Question 4

Which of the following is a direct effect of increased metabolic activity in muscle tissue?

Accepted Answer

Vasodilating substances are produced, causing arterioles and precapillary sphincters to dilate and increase blood flow.

Question 5

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

Accepted Answer

$$CO = HR 	imes SV$$

Question 6

A 50-year-old individual wants to exercise at 70% of their maximum heart rate. Using the formula $$	ext{Max HR} = 220 - 	ext{age}$$, what is their target heart rate?

Accepted Answer

$$	ext{Target HR} = 0.7 	imes (220 - 50) = 0.7 	imes 170 = 119$$ bpm

Question 7

Which of the following is NOT a modifiable risk factor for cardiovascular disease?

Accepted Answer

Genetics

Question 8

A patient with congestive heart failure is likely to experience which of the following symptoms due to fluid congestion?

Accepted Answer

Swollen ankles or legs

Question 9

Which procedure involves threading a small plastic tube into a blocked coronary artery and inflating a balloon to restore blood flow?

Accepted Answer

Balloon angioplasty

Question 10

Which of the following best explains why untreated diabetes mellitus increases the risk of cardiovascular disease?

Accepted Answer

High blood glucose damages blood vessels, increasing the risk of atherosclerosis and other cardiovascular complications.

Question 11

Which of the following scenarios is most likely to result in a stroke (cerebrovascular accident)?

Accepted Answer

A blood clot travels to and blocks a cerebral artery.

Question 12

Which of the following is a correct sequence of events in the baroreceptor negative feedback loop when blood pressure increases?

Accepted Answer

Baroreceptors stretch → sensory neurons fire → brain cardiovascular center → decreased heart rate and vascular resistance → blood pressure returns to normal

Question 13

Which of the following best describes an embolism?

Accepted Answer

A sudden blockage of a blood vessel by material (such as a blood clot) traveling in the bloodstream.

Question 14

A patient is diagnosed with myocardial infarction. Which of the following best describes what has occurred?

Accepted Answer

A region of heart tissue has died due to prolonged lack of blood supply.

Question 15

Which of the following treatments is most appropriate for a patient with congestive heart failure to reduce fluid buildup?

Accepted Answer

Diuretics

Question 16

Which of the following is a common symptom of a heart attack in women that may differ from men?

Accepted Answer

Jaw pain and nausea

Question 17

Which of the following equations correctly relates blood pressure ($$BP$$), cardiac output ($$CO$$), and vascular resistance ($$VR$$)?

Accepted Answer

$$BP = CO 	imes VR$$

Question 18

Which lifestyle modification would most directly reduce the risk of developing hypertension?

Accepted Answer

Reducing salt intake

Question 19

A patient with a history of angina undergoes a coronary angiogram. What is the primary purpose of this procedure?

Accepted Answer

To visualize blood vessels after filling them with contrast to identify blockages.

Question 20

Which of the following best explains why regular moderate exercise lowers the risk of cardiovascular disease?

Accepted Answer

It improves cardiac efficiency, lowers blood pressure, and helps maintain healthy blood vessels.

Regulation and Disorders of the Cardiovascular System

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