B5: THYROXINE AND ADRENALINE

Question 1

What does thyroxine do?

Answer 1

-regulates basal metabolic rate
-important for stimulating protein synthesis for growth and development

Question 2

What stimulates the thyroid gland to release thyroxine?

Answer 2

thyroxine is released in response TSH being released pituitary gland

Question 3

What happens if thyroxine levels are too high?

Answer 3

-release of TSH inhibited
-thyroxine levels decrease to normal

Question 4

What happens if thyroxine levels are too low?

Answer 4

-stimulates pituitary gland to release TSH
-thyroxine levels increase to normal

Question 5

What does adrenaline do?

Answer 5

-prepares body for ‘fight or flight’
-increases heart rate to increase supply of O2 and glucose to cells in brain and muscles which increases rate of respiration leading to an increase in energy released