Question 1

Which of the following best describes dynamic equilibrium in the context of homeostasis?

Accepted Answer

A condition where internal variables fluctuate within a narrow range around a set point.

Question 2

During intense exercise, which of the following best explains how the circulatory and respiratory systems work together to maintain homeostasis?

Accepted Answer

The circulatory system delivers more oxygen-rich blood to muscles, while the respiratory system increases oxygen intake and carbon dioxide removal.

Question 3

Which of the following is an example of a negative feedback loop in the human body?

Accepted Answer

Regulation of blood glucose levels by insulin and glucagon.

Question 4

A patient is diagnosed with hypertension. Which of the following best describes how this condition can disrupt homeostasis?

Accepted Answer

It puts extra strain on blood vessels and organs, increasing the risk of damage and disease.

Question 5

Which of the following equations correctly represents cardiac output ($CO$) in the human circulatory system?

Accepted Answer

$CO = HR 	imes SV$

Question 6

A person is exposed to cold temperatures. Which response best illustrates a homeostatic mechanism involving the circulatory system?

Accepted Answer

Vasoconstriction of blood vessels in the skin to reduce heat loss.

Question 7

Which of the following best explains the difference between hyperthermia and hypothermia?

Accepted Answer

Hyperthermia is an increase in body temperature above normal, while hypothermia is a decrease below normal.

Question 8

Which of the following statements about the pulmonary and systemic circuits is correct?

Accepted Answer

The pulmonary circuit carries deoxygenated blood from the heart to the lungs and returns oxygenated blood to the heart.

Question 9

A blockage in a coronary artery can lead to which of the following conditions, and how does it affect homeostasis?

Accepted Answer

Myocardial infarction; it reduces oxygen supply to heart muscle, impairing circulation.

Question 10

Which of the following best describes the role of the SA node in the heart?

Accepted Answer

It acts as the heart's natural pacemaker, initiating electrical impulses.

Question 11

A patient with a damaged left ventricle is likely to experience which of the following symptoms, and why?

Accepted Answer

Reduced blood flow to the systemic circuit, leading to fatigue and organ dysfunction.

Question 12

Which of the following best explains how technology has improved the treatment of circulatory disorders over time?

Accepted Answer

By providing advanced diagnostic tools and treatments such as pacemakers and stents.

Question 13

Which of the following is a correct sequence of blood flow through the heart and lungs?

Accepted Answer

Right atrium → right ventricle → lungs → left atrium → left ventricle → body

Question 14

If a person has a systolic blood pressure of 120 mmHg and a diastolic pressure of 80 mmHg, what is their pulse pressure?

Accepted Answer

$40\ \mathrm{mmHg}$

Question 15

Which of the following best describes the function of capillaries in the circulatory system?

Accepted Answer

They exchange gases, nutrients, and wastes between blood and tissues.

Question 16

A person with atherosclerosis has narrowed arteries. Which of the following is a likely consequence for homeostasis?

Accepted Answer

Reduced oxygen and nutrient delivery to tissues, impairing cellular function.

Question 17

Which of the following is a primary function of the circulatory system in maintaining homeostasis?

Accepted Answer

Transporting oxygen, nutrients, and wastes to and from cells.

Question 18

Which of the following best explains why the left ventricle has a thicker wall than the right ventricle?

Accepted Answer

It pumps blood at a higher pressure to the systemic circuit.

Question 19

Which of the following scenarios best illustrates a failure of homeostasis due to circulatory disease?

Accepted Answer

A person with heart failure experiences fluid buildup in the lungs.

Question 20

Which of the following statements about blood pressure is correct?

Accepted Answer

Systolic pressure is the maximum pressure during ventricular contraction.

Circulatory System: Homeostasis, Function, and Disease

Study Guide - Practice Questions