Question 1

Which of the following best describes the role of negative feedback in maintaining homeostasis?

Accepted Answer

It maintains conditions in the body close to a set point by reversing deviations.

Question 2

A patient is exposed to a hot environment. Which sequence correctly describes the negative feedback loop that helps regulate their body temperature?

Accepted Answer

Receptor senses heat, afferent pathway sends signal to control center, control center sends command via efferent pathway to effectors (sweat glands).

Question 3

Which of the following is an example of a variable that is regulated by negative feedback in the human body?

Accepted Answer

Body temperature

Question 4

If the set point for body temperature is $$37^\circ C$$, what would happen if the body temperature rises to $$39^\circ C$$ and negative feedback is functioning properly?

Accepted Answer

The body will initiate mechanisms to decrease temperature, such as sweating.

Question 5

Which component of the negative feedback system is responsible for detecting changes in a variable?

Accepted Answer

Receptor

Question 6

A person is running and their muscles produce excess heat. Which pathway carries information about the increased temperature to the brain?

Accepted Answer

Afferent pathway

Question 7

In the context of negative feedback, what is the 'set point'?

Accepted Answer

The homeostatic value the body tries to maintain.

Question 8

Which of the following best illustrates the function of an effector in a negative feedback loop?

Accepted Answer

Sending a command to sweat glands to produce sweat.

Question 9

A patient has a malfunction in their control center for temperature regulation. What is the most likely consequence?

Accepted Answer

The body will not be able to properly adjust temperature, leading to overheating or overcooling.

Question 10

Which of the following statements about negative feedback is correct?

Accepted Answer

Negative feedback opposes changes to maintain stability.

Question 11

If the efferent pathway is damaged, which of the following is most likely to occur?

Accepted Answer

Effectors will not receive commands from the control center.

Question 12

Which of the following best represents the flow of information in a negative feedback system?

Accepted Answer

Receptor → Afferent Pathway → Control Center → Efferent Pathway → Effector

Question 13

A person is exposed to cold temperatures. Which of the following is a likely effector response in a negative feedback loop?

Accepted Answer

Shivering to generate heat

Question 14

Which of the following is NOT a component of a negative feedback system?

Accepted Answer

Amplifier

Question 15

If a person’s sweat glands are not functioning, which part of the negative feedback loop is impaired?

Accepted Answer

Effector

Question 16

Which of the following best explains why negative feedback is compared to 'karma' in the study materials?

Accepted Answer

Because an increase in one direction leads to a compensatory decrease, balancing the system.

Question 17

A patient with a fever has a body temperature of $$39.5^\circ C. If $$the set point is $$37^\circ C$$, which of the following equations best represents the deviation from the set point?

Accepted Answer

$$39.5^\circ C - 37^\circ C = 2.5^\circ C$$

Question 18

Which of the following real-life scenarios best demonstrates negative feedback?

Accepted Answer

A person eats a large meal, and their blood glucose rises, triggering insulin release to lower glucose levels.

Question 19

Which of the following statements is true regarding the afferent and efferent pathways in a negative feedback loop?

Accepted Answer

Afferent pathways carry information from receptors to the control center, while efferent pathways carry commands from the control center to effectors.

Question 20

A person is unable to sweat in response to heat. Which part of the negative feedback loop is most likely malfunctioning?

Accepted Answer

Effector

Homeostasis and Negative Feedback Mechanisms in the Human Body

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