Question 1

Which of the following best describes homeostasis in the human body?

Accepted Answer

The process by which the body maintains a relatively stable internal environment despite external changes.

Question 2

Which of the following is NOT a component of a homeostatic control mechanism?

Accepted Answer

Stimulus generator

Question 3

A patient’s blood pH drops to 7.0. Which of the following best describes the consequence if homeostasis is not restored?

Accepted Answer

Cellular function will be disrupted, potentially leading to tissue and organ failure.

Question 4

Which of the following is an example of negative feedback?

Accepted Answer

Shivering to increase body temperature when it drops below normal.

Question 5

In the analogy of a thermostat regulating room temperature, what role does the thermostat play in homeostasis?

Accepted Answer

Control center

Question 6

Which of the following best describes the function of effectors in a homeostatic mechanism?

Accepted Answer

They carry out the response directed by the control center to restore balance.

Question 7

Which of the following is a real-life example of positive feedback in the human body?

Accepted Answer

Release of oxytocin to intensify uterine contractions during childbirth.

Question 8

If the concentration of sodium ions in the extracellular fluid increases, which level of biological organization is affected first?

Accepted Answer

Cells

Question 9

Which of the following equations best represents the relationship between blood pressure (BP), cardiac output (CO), and total peripheral resistance (TPR)?

Accepted Answer

$$BP = CO 	imes TPR$$

Question 10

A person is exposed to extreme cold. Which sequence correctly describes the negative feedback response?

Accepted Answer

Receptors detect drop in temperature → Control center processes information → Effectors (muscles) cause shivering

Question 11

Which of the following best explains why positive feedback is less common than negative feedback in the body?

Accepted Answer

Positive feedback amplifies changes, which can quickly move the body away from homeostasis.

Question 12

Which of the following is a homeostatically regulated factor in the body?

Accepted Answer

Osmolarity of body fluids

Question 13

A patient is unable to sweat due to a genetic disorder. Which homeostatic mechanism is most directly impaired?

Accepted Answer

Effector response to increased body temperature

Question 14

Which of the following best describes the role of the pancreas in homeostasis?

Accepted Answer

It acts as a control center by secreting hormones to regulate blood glucose.

Question 15

Which of the following scenarios best illustrates a failure of homeostasis?

Accepted Answer

A person with uncontrolled diabetes experiencing high blood glucose levels.

Question 16

Which of the following best describes the relationship between the extracellular fluid (ECF) and the intracellular fluid (ICF)?

Accepted Answer

The ECF surrounds the cells and provides the environment necessary for cellular function.

Question 17

Which of the following is the correct sequence of events in a typical negative feedback loop?

Accepted Answer

Stimulus → Receptor → Control center → Effector → Response

Question 18

Which of the following best explains why the loss of homeostasis can lead to death?

Accepted Answer

Disruption of the internal environment impairs cellular function, which can cascade to organ system failure.

Question 19

Which of the following is an example of a regulated variable in homeostasis?

Accepted Answer

Blood glucose concentration

Question 20

During blood clotting, activated platelets release chemicals that attract more platelets to the site of injury. This is an example of:

Accepted Answer

Positive feedback

Homeostasis: The Foundation of Human Physiology

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