Paper 2: Topic 5 Homeostasis & response - Homeostasis (LV) Flashcards Preview

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Flashcards in Paper 2: Topic 5 Homeostasis & response - Homeostasis (LV) Deck (13)
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1

Define the term homeostasis (2)

The maintenance of a stable internal environment even when the external environmental conditions changes

Keeping pH, temperature, water balance and blood glucose level all within acceptable ranges for the body

2

Why is homeostasis essential for all humans?

To ensure the internal conditions are kept optimal for enzyme controlled reactions

3

State the two systems that are both involved in homeostasis

Nervous system
Endocrine (hormonal) system

4

What type of response is homeostasis?

Automatic
No conscious thought or decision is required

5

State 4 internal conditions that are all regulated/controlled by homeostasis

pH
temperature
blood glucose level
water content

6

State the 3 components of an automatic control system

Receptors
Co-ordination centres
Effectors

7

Describe the role of a receptor in an automatic control system

To detect the stimulus (change in the environment)
and
produce a nerve impulse

8

Define the term 'stimulus'

A change in the environment

9

Describe the role of a co-ordination centre in an automatic control system

To receives and processes the information received from the receptors

10

Describe the role of an effector in an automatic control system

Produces a response to return the environmental factor back to its correct level i.e. counteracts the change

This restored the internal condition to its optimal level

11

State 2 types of effector

Muscle
Gland

12

Explain how the different effectors bring about a response in homeostasis

Muscles contract to bring about movement

Glands secrete hormones into the plasma

13

State 3 examples of co-ordination centres in humans

Brain
Spinal cord
Pancreas

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