Negative Feedback (AQA GCSE Biology Combined Science): Flashcards
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Negative feedback definition
Negative feedback definition
When body responds to increase/decrease in a factor by returning it to original level
What thyroxine regulates
What thyroxine regulates
Metabolic rate (reaction speed); 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
Negative feedback
What adrenaline stimulates
What adrenaline stimulates
'Fight or flight' response
Glands that release adrenaline
Glands that release adrenaline
Adrenal glands (on top of kidneys)
Adrenaline effect on heart and breathing rate
Adrenaline effect on heart and breathing rate
Increased heart rate and breathing rate
Adrenaline effect on glycogen in liver
Adrenaline effect on glycogen in liver
Converted to glucose for respiration
Adrenaline effect on pupils
Adrenaline effect on pupils
Pupils dilate to let in more light