kidneys and urea
- Created by: holly gooding
- Created on: 23-04-13 19:38
View mindmap
- kidneys
- are excretion organs
- blood is carried to the kidneys by renal arteries
- the clean blood leaves the kidneys by the renal veins
- they perform 3 main roles: removal of urea, adjustment of ion levels and adjustment of water content
- kidneys can stop working because of infections
- if the kidney does stop working then you can have a kidney donor or start dialysis
- nephrons are the filtration units in the kidney
- ultrafiltration
- a high pressure is built up this squeezes water, urea, ions and glucose out of the blood and into the bowman's capsule
- reabsorption
- as the liquid flows along the nephron, useful substances are rebsorbed for example glucose and sufficient water
- ultrafiltration
- kidneys regulate water content
- done by negative feedback
- the amount of water reabsorbed in the kidney nephrons is controlled by anti-diuretic hormone(ADH)
- Urea
- is poisonous
- filtered out of the blood to make urine
- is produced by the liver from excess amino acids
Comments
No comments have yet been made