Hormonal control of metabolic rate Flashcards
Metabolic rate
rate at which energy stored in food is transferred by all reactions that take place in your body to keep you alive
Thyroxine
Hormone released by thyroid gland
What does thyroxine do
causes heart cells to contact rapidly and strongly and increases rate of proteins and carbs being broken down
What two glands control amount of thyroxine released by the thyroid gland
Hypothalamus
Pituitary gland
Negative feedback
control mechanism which brings the set value back to normal
How is the release of adrenalin caused
an increase in impulses in neurones reaching adrenal glands from spinal chord
What does adrenalin do to the liver
activates breakdown of glycogen. when this breaks down glucose is released into the blood, increasing energy
What can the response caused by Adrenalin be called
fight or flight response
What does adrenalin do the the heart
causes heart muscle cells to :
contract more rapidly, increasing heart rate
contract strongly increasing blood pressure
What does adrenalin do to blood vessels
vasodilation and vasoconstriction
What happens when there are low levels of thyroxine
stimulates production of TRH in hypothalamus
What does the TRH do
causes release of TSH from pituitary gland
What does the TSH do
acts on thyroid gland to produce thyroxine
