Homeostasis And Negative Feedback

Question 0

List some conditions that many living organisms have to keep constant inside the body.

Answer 0

Blood temperature.
Blood glucose concentration.
Blood salt concentration.
Water potential of the blood.
Blood pressure.
Carbon dioxide concentration.

Question 1

Define the term homeostasis.

Answer 1

Homeostasis is the maintenance of the internal environment in a constant state despite external changes.

Question 2

Define negative feedback.

Answer 2

Negative feedback is the process that brings about a reversal of any change in conditions. It ensures that an optimum steady state can be maintained, as the internal environment is returned to its original set conditions after any change. It is essential for homeostasis.

Question 3

Define positive feedback.

Answer 3

Positive feedback is a process that increases any change detected by the receptors. It tends to be harmful and does not lead to homeostasis.

Question 4

Explain what the difference is between positive and negative feedback.

Answer 4

A

Question 5

Match each component if a heating system to its role in negative feedback:
Thermostat. Effector.
Boiler. Communication.
Electric cables. Receptor.

Answer 5

Boiler. Effector
Electric cables. Communication
Thermostat. Receptor.