$$\text{Stimulus} \rightarrow \text{Sensor} \rightarrow \text{Response}$$

Question 1

Which of the following best describes the role of a regulator in maintaining homeostasis?

Accepted Answer

A regulator uses internal control mechanisms to maintain stability despite external fluctuations.

Question 2

Which animal is most likely to be a temperature conformer based on the provided materials?

Accepted Answer

Largemouth bass

Question 3

What is the primary function of negative feedback in biological systems?

Accepted Answer

To return a variable to a normal range or set point

Question 4

Which of the following is an example of positive feedback in humans?

Accepted Answer

Amplification of uterine contractions during childbirth

Question 5

In the blood glucose regulation pathway, what is the role of insulin?

Accepted Answer

Insulin causes body cells to take up more glucose, lowering blood glucose levels.

Question 6

Which of the following best describes the difference between endotherms and ectotherms?

Accepted Answer

Endotherms maintain a stable internal temperature using a high metabolic rate, while ectotherms' body temperature varies with the environment.

Question 7

Which of the following is NOT an example of a variable regulated by homeostasis?

Accepted Answer

Hair color

Question 8

A person skips a meal and their blood glucose level falls. What hormone is released and what is its effect?

Accepted Answer

Glucagon is released, causing the liver to break down glycogen and release glucose.

Question 9

Which of the following best illustrates a negative feedback loop?

Accepted Answer

Thermostat turning heater on when room temperature drops below set point

Question 10

Why is a secondary messenger like cAMP used in cell signaling pathways?

Accepted Answer

It allows the signal to be amplified and distributed to multiple targets within the cell.

Question 11

Which of the following equations best represents the relationship between stimulus, sensor, and response in homeostasis?

Accepted Answer

$$	ext{Stimulus} ightarrow 	ext{Sensor} ightarrow 	ext{Response}$$

Question 12

A snake is placed in an environment where the temperature increases from 10°C to 30°C. What happens to its body temperature?

Accepted Answer

It increases, matching the ambient temperature.

Question 13

Which of the following is a correct sequence for a signal transduction pathway?

Accepted Answer

Reception → Transduction → Response

Question 14

If a person’s blood pH drops below the normal range, what is the most likely physiological response?

Accepted Answer

The body will initiate mechanisms to raise the pH back to normal through negative feedback.

Question 15

Which of the following statements about feedback mechanisms is true?

Accepted Answer

Negative feedback counteracts changes to maintain stability.

Question 16

A patient with diabetes drinks a tea containing Gymnema sylvestre. What is a potential risk based on the study materials?

Accepted Answer

Blood sugar levels may be affected, posing a risk for those with diabetes.

Question 17

Which of the following best describes the effect of glucagon on blood glucose levels?

Accepted Answer

Glucagon stimulates the liver to break down glycogen and release glucose into the blood.

Question 18

Which of the following is a real-life example of a negative feedback loop?

Accepted Answer

Regulation of room temperature by a thermostat

Question 19

What is the main reason adenylyl cyclase cannot directly activate protein kinase A?

Accepted Answer

A secondary messenger like cAMP is needed to amplify and distribute the signal within the cell.

Question 20

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

Accepted Answer

The value at which a variable is maintained for optimal function.

Homeostasis and Feedback: Regulation in Animals

Study Guide - Practice Questions