Excretion
- Created by: niamh_herron6
- Created on: 11-07-17 12:58
View mindmap
- 5.2.1 - Excretion
- Excretory Organs
- Lungs - CO2 diffuses into alveoli to be excreted when we breathe out.
- Liver - many metabolic roles, substances passed into the bile for excretion with faces i.e. bilirubin
- - Also converts excess amino acids to urea- deamination
- Kidneys - urea passed to kidneys through bloodstream in plasma - removed from blood to become part of urine.
- Urine stored in bladder before being excreted from body via urethra.
- Skin - sweat contains salts, urea, uric acid, ammonia, water - all excretory products.
- Skin involved in excretion but not primary function of the skin.
- Importance of excretion
- Danger of build up of products of metabolism
- CO2 and ammonia = toxic
- Interfere with cell processes - alter pH, normal metabolism is prevented
- Products may act as inhibitors - reduce activity of essential enzymes.
- CO2
- Most CO2 transported as hydrogen carbonate ions.
- Excretory Organs
Comments
No comments have yet been made