In response to stressful or scary situations your brain detect stress and sends nervousimpulses to the adrenal gland that respond by secreting adrenaline
What does adrenaline do?
It triggers mechanisms that increases supply of oxygen and glucose to cells in the brain and muscles
How does your body control the levels of hormones in the blood?
By using negative feedback systems
where is thyroxine released from?
The thyroid gland
Why is thyroxine important?
It helps regulate the basal metabolic rate and stimulates proteinsynthesis for growth and development
What is the basal metabolic rate?
The speed that chemical reactions in the body occur while the body is at rest
What happens if the blood thyroxine level is too high?
The secretion of TSH from the pituitarygland is inhibited (stopped) which reduces the amount of thyroxine release from the thyroid gland, so the level falls back to normal
When secreted from the pituitary does THS increase or decrease the amount of thyroxine released?