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Paper 2 ✅
B5 - Homeostasis and Response
5.16 - Adrenaline and Thyroxine
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When is adrenaline produced?
Adrenaline is produced during the
fight or flight response
, when you get scared, stressed, or need to exercise. It prepares the body for activity.
What does adrenaline do?
Increases
heart rate
Increases
blood pressure
Increases blood flow to
muscles
Increases blood sugar (
glucose
) levels by stimulating the
liver
to break
glycogen
down into glucose
Adrenaline causes the conversion of which substances?
Glycogen
->
Glucose
What does thyroxine do?
Increases your
metabolic rate
(the rate at which chemical reactions are taking place.
How is the production of thyroxine regulated?
The
pituitary gland
produces
Thyroxine
Stimulating Hormone (TSH) which stimulates the thyroid gland to produce thyroxine.
Thyroxine then inhibits the production of TSH from the pituitary gland.