Question 1

Which of the following best describes the role of negative feedback in homeostatic regulation?

Accepted Answer

It reverses the direction of the initial change, returning the variable toward its set point.

Question 2

A patient’s blood glucose rises after a meal. Which sequence correctly describes the negative feedback response to restore homeostasis?

Accepted Answer

Pancreas releases insulin, causing glucose uptake by cells, lowering blood glucose.

Question 3

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

Accepted Answer

Blood clotting after vessel injury

Question 4

A home heating system is used as an analogy for negative feedback. In this analogy, what does the thermostat represent?

Accepted Answer

The sensor and integrator

Question 5

Which of the following equations best represents the error signal in a homeostatic control system?

Accepted Answer

$$X - X_{set}$$

Question 6

Which of the following is NOT a limitation of homeostatic control systems?

Accepted Answer

They can keep all internal variables perfectly constant at all times.

Question 7

During childbirth, uterine contractions become stronger and more frequent due to the release of oxytocin. This is an example of:

Accepted Answer

Positive feedback

Question 8

Which of the following best describes a feedforward (anticipatory) response?

Accepted Answer

A response that maintains a variable at a set point by acting in anticipation of a change.

Question 9

Which of the following variables is homeostatically regulated in the human body?

Accepted Answer

Blood glucose concentration

Question 10

A person becomes dehydrated and feels thirsty, prompting them to drink water. Is this an example of negative or positive feedback, and why?

Accepted Answer

Negative feedback, because drinking water restores fluid balance toward the set point.

Question 11

Which component of a homeostatic control system is responsible for carrying out the response to restore the regulated variable?

Accepted Answer

Effector

Question 12

If the set point for core body temperature is $$37^\circC $$and the actual temperature is $$38^\circC$$, what is the error signal?

Accepted Answer

$$1^\circC$$

Question 13

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

Accepted Answer

Positive feedback pushes variables away from the set point, which can be destabilizing.

Question 14

A patient with uncontrolled diabetes has persistently high blood glucose levels. This is an example of:

Accepted Answer

Homeostatic imbalance

Question 15

Which of the following is the correct sequence of components in a homeostatic control system?

Accepted Answer

Sensor → Integrator → Effector

Question 16

Which of the following statements about homeostatic mechanisms is TRUE?

Accepted Answer

They continuously monitor and adjust physiological variables to maintain optimal ranges.

Question 17

If a homeostatic system attempts to keep blood pressure constant but, as a result, blood pH moves away from its set point, this illustrates which limitation of homeostatic control?

Accepted Answer

Maintaining one property constant may require moving others away from their set point.

Question 18

Which of the following best describes the function of the integrator in a homeostatic control system?

Accepted Answer

Compares the actual value to the set point and determines the output of effectors.

Question 19

Which of the following is an example of a feedforward response in the digestive system?

Accepted Answer

Release of saliva in response to the sight or smell of food

Question 20

Which of the following best explains why dramatic changes in a single homeostatically regulated variable can be life-threatening?

Accepted Answer

Because many properties of the internal environment are interrelated, and a change in one can lead to a cascade of problems.

Homeostasis and Feedback Mechanisms in Anatomy & Physiology

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