Question 1

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

Accepted Answer

Dynamic constancy, where parameters fluctuate around a set point

Question 2

After eating a meal, blood glucose levels rise above the set point. Which mechanism is primarily responsible for returning blood glucose toward the set point?

Accepted Answer

Negative feedback

Question 3

Which equation correctly represents the relationship between steady state and equilibrium?

Accepted Answer

$$SS
eq equilibrium$$

Question 4

A person exposed to cold weather allocates more energy to maintaining body temperature. What is the most likely consequence of this energy allocation?

Accepted Answer

Less energy is available for other steady state functions, such as immune defense

Question 5

Which of the following best illustrates a feedforward mechanism?

Accepted Answer

Eating before feeling hungry to prevent a drop in blood glucose

Question 6

In the reflex arc template, which component is responsible for integrating information and preparing a response?

Accepted Answer

Integrating center

Question 7

Which pathway in the homeostatic control system carries information from the sensor to the integrating center?

Accepted Answer

Afferent pathway

Question 8

A disturbance $$D$$ moves a parameter away from steady state. Which sequence best represents the homeostatic response?

Accepted Answer

$$Disturbance \rightarrow Reaction \rightarrow Response/Feedback$$

Question 9

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

Accepted Answer

Childbirth, where uterine contractions intensify until delivery

Question 10

Which statement about biorhythms is correct?

Accepted Answer

Biorhythms are proactive, functioning as feedforward mechanisms

Question 11

A person working night shifts experiences a change in their sleep pattern. This change is best described as:

Accepted Answer

Adjustment/acclimation

Question 12

Which of the following best distinguishes adaptation from adjustment?

Accepted Answer

Adaptation involves genetic changes, adjustment does not

Question 13

Which scenario best illustrates developmental acclimatization?

Accepted Answer

A child exposed to lead during development has altered brain function

Question 14

Which of the following is NOT a characteristic of direct intercellular communication?

Accepted Answer

Always involves molecules traveling outside the cell before entering another

Question 15

Gap junctions allow for which type of communication between cells?

Accepted Answer

Short, narrow channels for ions and small molecules

Question 16

Which of the following best describes juxtacrine communication?

Accepted Answer

Transient protein connections between cell membranes

Question 17

A patient exposed to a new environment develops a reversible change in their physiological set point. This change is best described as:

Accepted Answer

Acclimation

Question 18

Which of the following is a plausible consequence of maintaining steady state in the body?

Accepted Answer

Energy expenditure is necessary, even if the parameter is not changing

Question 19

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

Accepted Answer

Produces a compensatory response to restore steady state

Question 20

Which of the following statements about circadian rhythms is correct?

Accepted Answer

Circadian rhythms operate on an approximately 24-hour cycle, even without external cues

Homeostasis and Cellular Communication: Foundations of Anatomy & Physiology

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