Negative Feedback (AQA GCSE Biology): Flashcards
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Practise the cards
15 cards from this deck
Negative feedback
Negative feedback
When body responds to change by returning factor to original level
Thyroxine function
Thyroxine function
Regulates metabolic rate
Metabolic rate
Metabolic rate
How quickly reactions occur
Thyroxine role in body development
Thyroxine role in body development
Important in growth and development
Gland that releases thyroxine
Gland that releases thyroxine
Thyroid gland
Hormone that stimulates thyroxine release
Hormone that stimulates thyroxine release
Thyroid stimulating hormone (TSH)
How thyroxine levels are controlled
How thyroxine levels are controlled
By negative feedback
What detects high thyroxine levels
What detects high thyroxine levels
Receptors in the brain
Effect of high thyroxine on TSH release
Effect of high thyroxine on TSH release
Inhibits TSH release
When adrenaline is produced
When adrenaline is produced
In times of fear or stress
Response stimulated by adrenaline
Response stimulated by adrenaline
'Fight or flight' response
Glands that release adrenaline
Glands that release adrenaline
Adrenal glands (on top of kidneys)
Adrenaline effect on heart & breathing rate
Adrenaline effect on heart & breathing rate
Increases both to deliver more oxygen and glucose
Adrenaline effect on liver glycogen
Adrenaline effect on liver glycogen
Converts glycogen to glucose for respiration
Adrenaline effect on pupils
Adrenaline effect on pupils
Pupils dilate to let in more light