Question 1

Which of the following best defines homeostasis?

Accepted Answer

The maintenance of relatively stable internal conditions despite continuous changes in the outside world.

Question 2

Which of the following is NOT an example of a physiological process maintained by homeostasis?

Accepted Answer

Accumulation of metabolic wastes in the bloodstream.

Question 3

A homeostatic control mechanism consists of three essential components. Which sequence correctly describes their order of function?

Accepted Answer

Receptor → Control Center → Effector

Question 4

Which of the following best describes a negative feedback mechanism?

Accepted Answer

The response reduces or shuts off the original stimulus, causing variable changes in the opposite direction.

Question 5

Which scenario is an example of positive feedback in the human body?

Accepted Answer

Enhancement of labor contractions by oxytocin.

Question 6

A patient is experiencing a fever. Which homeostatic control mechanism is primarily responsible for returning their body temperature to normal?

Accepted Answer

Negative feedback mechanism involving the nervous system.

Question 7

Which of the following equations best represents the concept of dynamic equilibrium in homeostasis?

Accepted Answer

$$\sum_{i=1}^{n} (Input_i - Output_i) \approx 0$$

Question 8

Which statement about homeostatic imbalance is correct?

Accepted Answer

Most diseases are seen as a disturbance of homeostasis.

Question 9

In the regulation of blood glucose, which feedback mechanism is primarily involved?

Accepted Answer

Negative feedback involving insulin and glucagon.

Question 10

Which of the following is a correct comparison between the somatic and autonomic nervous systems?

Accepted Answer

Somatic nervous system innervates skeletal muscle; autonomic innervates smooth muscle, cardiac muscle, and glands.

Question 11

Which of the following best describes the role of the effector in a homeostatic control mechanism?

Accepted Answer

It receives output from the control center and produces a response.

Question 12

A patient with diabetes mellitus has difficulty regulating blood glucose levels. Which part of the homeostatic control mechanism is most likely impaired?

Accepted Answer

Effector (pancreatic cells producing insulin)

Question 13

Which of the following is TRUE regarding the conduction speed of axons in the autonomic nervous system (ANS)?

Accepted Answer

Postganglionic axons are thin and unmyelinated, resulting in slower conduction.

Question 14

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

Accepted Answer

Regulation of body temperature by sweating when overheated.

Question 15

If negative feedback mechanisms become overwhelmed, what is a possible consequence?

Accepted Answer

Destructive positive feedback mechanisms may take over, increasing risk for illness.

Question 16

Which formula best represents the relationship between stimulus and response in a negative feedback loop?

Accepted Answer

$$Response = -Stimulus$$

Question 17

Which of the following is NOT a function of the autonomic nervous system (ANS)?

Accepted Answer

Innervating skeletal muscle for voluntary movement.

Question 18

Which of the following statements about positive feedback is correct?

Accepted Answer

Positive feedback enhances or exaggerates the original stimulus, so the output is further stimulated.

Question 19

Which pathway correctly describes the flow of information in a homeostatic control system?

Accepted Answer

Stimulus → Receptor → Afferent pathway → Control Center → Efferent pathway → Effector → Response

Question 20

A person is exposed to cold weather and begins shivering. Which part of the homeostatic control mechanism is responsible for initiating shivering?

Accepted Answer

Effector (skeletal muscles)

Homeostasis and the Autonomic Nervous System: Foundations in Anatomy & Physiology

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