Unit 4

Question 1

Homeostasis

Answer 1

The tendency of the body to maintain a relatively constant internal environment

Question 2

Sensor

Answer 2

A body structure that monitors and detects changes in the internal environment

Question 3

Control Centre

Answer 3

A body structure that sets the range of values within which a variable should be maintained receives information from the sensor, and sends signals to effectors when needed

Question 4

Effector

Answer 4

A body structure that responds to signals from a control centre to effect change in a variable

Question 5

Negative Feedback System

Answer 5

Mechanism of homeostatic response by which the output of a system recesses a change in a variable, bringing the variable back to within normal range

Question 6

Positive Feedback System

Answer 6

Mechanism of homeostatic response by which the output of a system strengthens or increases a change in a variable