4 Homeostasis

Question 1

What is homeostasis (define)

Answer 1

Maintenance of near constant condition in an internal environment

Question 2

What is a negative feedback mechanism

Answer 2

The output response reversed the stimulus and restores parameter towards set norm

Question 3

What is the positive feedback mechanism

Answer 3

The output response enhances or amplified stimulus

Question 4

What is the pathway for homeostasis

Answer 4

1) stimulus
2) receptor (sensor)
3) control centre
4) effector
5) response

Question 5

Describe the thermoregulation process

Answer 5

Stimulus: the condition deviates from set point
Receptor: thermorecepters in skin detect change in body temperature and sends nerve impulses to control center
Control center: brain responds to change in body temp by sending nerve impulse
Effectors: to affect its at different parts of the body, carrying out responses

If body temp below:
Vasoconstriction, hair raised, shivering, increased metabolic rate

If body temp above:
Vasodilation, sweat glands, decreased metabolic rate, increased heart rate

Response restores/reverses stimuli to normal range by negative feedback