hormone control of metabolic rate - SB7 Flashcards
Where is thyroxine produced and what is it’s role?
- In the thyroid gland
- it’s role is to stimulate the basal metabolic rate to increase - It controls the speed at which oxygen and food products react to release energy for the body to use.
- Thyroxine also plays an important role in growth and development
via n________ f_______
How are thyroxine levels controlled?
negative feedback
what 2 parts of the brain are important in controlling thryoxine levels?
pituitary gland and hypothalamus
what happens when there are low thyroxine levels in the bloodstream?
low levels stimulate hypothalamus to release TRH which causes pituitary gland to release TSH so the thyroid releases more thyroxine and blood levels return to normal
what happens when there are normal thyroxine levels in the bloodstream?
normal thryoxine inhibits TRH release from the hypothalamus and the production of TSH by the pituitary, so normal blood levels are maintained
where is adrenaline produces and what is it’s role?
produces in the adrenal glands in times of fear and stress by preparing for fight or flight
what does adrenaline do? (in detail) is it controlled by negative feedback?
what does it increase? where does it boost delivery and of what?
It targets vital organs, increases the heart rate and boosts the delivery of oxygen and glucose to the brain and muscles. not controlled by negative feedback
What are the effects of adreneline release into the blood stream?
- increases breathing rate, heart rate (therefore blood flow) and blood pressure
- conversion of glycogen to glucose in liver cells, increasing blood glucose
what is the result of adreneline release in blood stream?
These effects result in more glucose being delivered to the muscles and more energy being released by respiration in the muscles.
