Unit 3- Homeostasis Flashcards
What are the 6 things that need to be controlled?
1) temperature
2) water control
3) ion content
4) blood sugar
5) CO2
6) urea
What controls the homeostasis? Where is it found?
The thermoregulatory centre, in the brain
What 3 things happen when you too hot?
1) hairs lie flat to open poures
2) sweat
3) blood vessels dialate
What 4 things happen when the body gets too cold?
1) shiver
2) blood vessels constrict
3) hair stand to block poures
4) no sweat produced
What 3 things do the kidneys do?
Filter the blood: removes urea, adjusts ions, adjusts water content.
Where does the removal of urea happen?
Liver
What are nephrons?
Filtration units in the kidneys
What is ultrafiltration?
When a high pressure is built up to squeeze water and urea etc out the blood and into the bowmans capsule
What is reabsorption?
When useful substances are reabsorbed back into the blood.
What is kidney dialysis?
Uses a machine with a selectively permeable membrane to filter out waste products.
What two things control blood glucose levels?
Insulin, glucagon
What does the pancreas do when there is too much glucose?
It secretes insulin which dissolves glucose, the liver then removes the insulin taking some of the dissolved glucose.
What happens when there is too little glucose?
The pancreas secrets glucagen, this is taken in by the liver and turned into glucose.
What is type 1 diabetes?
Lack of insulin so too much glucose
What is homeostasis?
To keep a maintenance of a constant environment
