Homeostasis Flashcards
What is homeostasis
The regulation of internal conditions of cells to maintain conditions for functioning
What are receptors?
Cells that detect changes in the internal or external environment (stimuli)
What are coordination centres?
What do they do?
areas that receive and process signals from receptors. They send out and coordinate the response of the body
What are effectors?
Muscles or glands that bring about responses to the stimulus
What is body temperature monitored by?
The hypothalamus
What happens if body temperature is too high?
Blood vessels dilate (vasodilation) and swear is produced from the sweat glands. Causing a transfer of energy from the skin to the environment.
What happens if the body temperature is too low?
The blood vessels constrict (vasoconstriction) and the skeletal muscles contract and release (shivering)
Where is adrenaline produced?
The adrenal glands
Where is thyroxine produced?
The thyroid gland
Where is insulin produced?
The pancreas
What does insulin do?
Reduces glucose levels in the blood by signalling the liver to store glucose and helping glucose move out of your blood into cells.
What does glucagon do?
Glucagon is released by your pancreas and it instructs the liver to release glycogen( stored glucose) into the blood to raise levels
What is TSH? Where is it produced?
Thyroxine stimulating hormone.
In the pituitary gland
What does thyroxine do?
It is responsible for regulating growth and brain development and it controls the basal metabolic rate
What does adrenaline do?
Adrenaline increases heart rate and blood pressure and dilates the pupils. It triggers fight or flight response. It also enlarged air passages to boost delivery of oxygen and glucose to the brain and muscles
