Homeostasis (AQA GCSE Biology): Flashcards

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Homeostasis
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What is homeostasis?

Keeps internal conditions steady and balanced

Causes of enzyme denaturation

Temperature too hot or pH too high/low

3 things body controls via homeostasis

Body temp (37°C37°C), blood glucose, water levels

Optimal body temperature

37°C37°C

2 types of control responses

Nervous (fast) and chemical/hormones (slower)

3 parts of all control systems

Receptors, coordination centres, effectors

Role of receptors in control

Detect stimuli (changes in environment or body)

Role of coordination centres

Receive info from receptors and decide what to do

Role of effectors

Muscles or glands that make the changes needed

Definition of negative feedback

System acts to reverse changes, return to set point

Body's response to excess water

Kidneys reabsorb less, produce watery urine

Body's response to low water

Kidneys reabsorb more, produce concentrated urine

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