Chapter 2: Homeostasis

Question 1

Homeostasis

Answer 1

The relative stability of the internal environment. A “set point”. Ex. body’s temperature, blood sugars, CO2, O2, pH, etc.

Question 2

What are feedback loops?

Answer 2

Uses positive and negative feedback loops to restore homeostasis.

Question 3

Negative Feedback

Answer 3

Acts to oppose the stimulus that triggers them and brings body back to set point. Ex. being cold results in shivering.

Question 4

Positive Feedback

Answer 4

Amplifies the starting signal in processes that need to be pushed to completion, not when status quo need to be maintained.

Question 5

Example of positive feedback?

Answer 5

Labour

Question 6

What are the 4 basic components of feedback loops?

Answer 6

Sensor mechanism, Control centre, effector mechanism, and feedback.

Question 7

Afferent: ______ to ______

Answer 7

Sensor, brain

Question 8

Efferent: ______ to _______

Answer 8

Brain, sensor

Question 9

What is sensor mechanism?

Answer 9

Senses a change

Question 10

What is the control centre?

Answer 10

Analyzes the change and sends out “instructions” to deal with it.

Question 11

What is effector mechanism?

Answer 11

Responds to “instructions” from control centre.

Question 12

What is feedback?

Answer 12

Detects if change has occurred.

Question 13

Afferent is brain to sensor T | F

Answer 13

False