Chapter Test [Homeostasis]

Which of the following best explains the importance of homeostasis?

• It is important to detect changes in the normal conditions of the internal environment.

• It is important to bring about the appropriate corrective response mechanism to reverse the changes in the normal conditions of the internal environment.

• It is important to maintain a stable internal environment to allow the body function optimally.

• It is important to signal to the receptor that the normal conditions of the internal environment have been restored through negative feedback.

The following show the different components involved in homeostasis.

1) Receptor

2) Negative Feedback

3) Stimulus

4) Regulatory (Corrective) Mechanism

Which of the following correctly lists the order that the different components are involved in homeostasis?

• 1 --> 3 --> 4 --> 2

• 1 --> 3 --> 2 --> 4

• 3 --> 1 --> 2 --> 4

• 3 --> 1 --> 4 --> 2

Which of the following is not a function of skin?

• Absorption

• Excretion

• Protection

• Regulation of body temperature

Which of the following states the sources from where we gain heat?

1) Metabolic activities

2) Exhalation

3) Internal environment

4) External environment

• 1 and 2 only

• 1 and 3 only

• 1, 2 and 3 only

• 1, 3 and 4 only

Which of the following states the activities by which the skin allows heat loss?

1) Conduction

2) Convection

3) Radiation

4) Evaporation of sweat

• 1 and 2 only

• 1, 2 and 3 only

• 1, 2 and 4 only

• 1, 2, 3 and 4

Which of the following is true about shunt vessels when there is an increase in body temperature?

• A

• B

• C

• D

Study the diagrams. Which of the following best classifies the activity that takes place in the body?

• Receptor

• Negative Feedback

• Stimulus

• Regulatory (Corrective) Mechanism

The graph shows changes in a person's body temperature plotted against time.

What causes the change in temperature between X and Y?

• Increased air temperature

• Increased evaporation of sweat

• Reduced blood flow through surface capillaries

• Shivering

What happens to the arterioles near the surface of the skin when the body temperature rises?

• They absorb oxygen from the surrounding tissues.

• They dilate and become wider.

• They move nearer the skin surface.

• They take in water from the surrounding tissues.

Which combination of factors helps prevent the loss of heat from the body?

• A

• B

• C

• D