adrenaline and thyroxine Flashcards
where is adrenaline released?
adrenal glands
why is adrenaline released?
in response to fear or stress
how does adrenaline work?
it increases the heart rate and boosts the delivery of oxygen and glucose to the brain and muscles, preparing the body for ‘flight or fight’
what is the level of hormones controlled by?
negative feedback systems
where is thyroxine released from?
thyroid gland
role of thyroxine
- stimulates the basal metabolic rate
- plays an important role in growth and development (stimulates protein synthesis)
what is thyroxine released in response to?
TSH - thyroid stimulating hormone
where is TSH released from?
pituitary gland
what are thyroxine levels controlled by?
negative feedback
what happens when the level of thyroxine in the blood is too high?
secretion of TSH is inhibited
4 changes to body when adrenaline released
- heart rate increase
- blood pressure increase
- increase blood flow to muscles
- increase blood sugar levels
what conversion of substances does adrenaline cause?
glycogen to glucose
