Introduction

Question 1

Life processes:

Answer 1

Movement
Reproduction
Sensitivity

Growth
Respiration
Excretion
Nutrition

Question 2

Homeostasis =
body -
internal environment -
cellular -

Answer 2

control of vital parameters

• blood volume and pressure
• plamsa O levels, nutrients, electrolytes, core temperature
• ATP, ions

Question 3

Feedback system:
homeostasis disrupted
- receptors
- control centre
- output
- effector

Answer 3

receptors - sense vital parameter
control centre - compare imput to set point
output - signal from control centre to effector
effector - enables change to return to normal

Question 4

negative feeback

Answer 4

adjustment in opposite direction, returns parameter to original level

Question 5

positive feedback

Answer 5

adjustment in same direction, strengthens change to move parameter further from original level