Unit 3: Chapter 6 - Dectecting And Regulating Change

Question 1

Homeostasis

Answer 1

The process of keeping the internal environment inside the body constant

Question 2

Steady state

Answer 2

The aim of homeostasis, to maintain a steady state where the input and output of materials and energy is balanced.

Question 3

Tolerance limits

Answer 3

The upper and lower limits to a range of factors (beyond which dysfunction occurs
Examples
Core body temp
Ph and concentrations of dissolved substances in the blood
Concentrations of oxygen and carbon dioxide in blood
Blood glucose levels

Question 4

Set point

Answer 4

Conditions are maintained around a set point

Eg. Body temperature (37°C)

Question 5

Dynamic equilibrium

Answer 5

The fluctuation of conditions throughout the body

Question 6

Feedback

Answer 6

X

Question 7

Negative feedback

Answer 7

Causes the stimulus to change in the opposite direction to the original change

Question 8

Positive feedback

Answer 8

Intensifies the effect of the original stimulus. It amplifies.
This type of feedback has no role in homeostasis
E.g amplifying contractions during childbirth

Question 9

Feedback systems

Answer 9

Circular situations in which the body response to stimulus with a response that alters the original stimulus
Can be psychological or behavioural