Question 1

Which of the following best describes the difference between anatomy and physiology?

Accepted Answer

Anatomy studies the location and composition of body structures, while physiology studies how those structures work alone and as part of a system.

Question 2

Which of the following is the correct order of the hierarchy of complex organization in the human body, from largest to smallest?

Accepted Answer

Organism, organ system, organ, tissue, cell, molecule

Question 3

A patient’s body temperature rises to 102°F. Which of the following best describes the homeostatic response that would occur?

Accepted Answer

The body would activate sweat glands and increase blood flow to the skin to promote heat loss.

Question 4

Which of the following is an example of a negative feedback mechanism?

Accepted Answer

Sweating to cool the body when body temperature rises

Question 5

Which of the following best explains why homeostasis is described as a 'dynamic equilibrium'?

Accepted Answer

The body allows variables to fluctuate within a limited range around a set point.

Question 6

A thermostat in a house is set to 68°F. When the temperature drops below this point, the heater turns on. When it rises above 68°F, the heater turns off. This is an example of:

Accepted Answer

Negative feedback

Question 7

Which of the following is NOT a component of a regulatory mechanism that maintains homeostasis?

Accepted Answer

Antibody

Question 8

During childbirth, the head of the fetus pushes against the cervix, causing the release of oxytocin, which intensifies contractions. This is an example of:

Accepted Answer

Positive feedback

Question 9

Which of the following best describes intrinsic (autoregulation) homeostatic regulation?

Accepted Answer

A cell, tissue, or organ system automatically adjusts its activities in response to a change in the internal environment.

Question 10

A person loses blood due to an injury. Local chemical signals cause nearby blood vessels to dilate, increasing blood flow to the area. This is an example of:

Accepted Answer

Autoregulation (intrinsic regulation)

Question 11

Which of the following statements about extrinsic regulation is TRUE?

Accepted Answer

It involves adjustment of cell activities by signals from the nervous or endocrine system.

Question 12

Which of the following best describes the role of the integration center in a homeostatic control system?

Accepted Answer

It processes information from receptors and determines the appropriate response.

Question 13

If the normal blood pH is approximately 7.4, what would be the likely effect if the pH dropped to 6.8 and was not corrected?

Accepted Answer

Cellular processes would be disrupted, potentially leading to death.

Question 14

Which of the following is an example of extrinsic regulation?

Accepted Answer

The nervous system increases heart rate during exercise.

Question 15

Which of the following best illustrates the concept of a set point in homeostasis?

Accepted Answer

Blood glucose levels are maintained around 90 mg/dL, with minor fluctuations.

Question 16

A patient is experiencing dehydration, leading to a decrease in blood volume. Which system is most likely to respond slowly to restore homeostasis?

Accepted Answer

Endocrine system

Question 17

Which of the following best describes the relationship between receptors and effectors in a homeostatic system?

Accepted Answer

Receptors detect changes in the environment, while effectors produce the response to restore homeostasis.

Question 18

Which of the following equations best represents the concept of homeostatic balance for a variable $$X$$?

Accepted Answer

$$X_{set} - \Delta X \leq X \leq X_{set} + \Delta X$$

Question 19

A person is exposed to cold weather, causing their body temperature to drop. Which of the following responses is an example of an effector action in negative feedback?

Accepted Answer

Skeletal muscles begin to shiver, generating heat.

Question 20

Which of the following scenarios best demonstrates the failure of homeostatic regulation?

Accepted Answer

A diabetic patient’s blood glucose remains elevated despite insulin therapy.

Introduction to Anatomy & Physiology: Homeostasis and Regulatory Mechanisms

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