6.6 STRUCTURE OF THE HUMAN GAS-EXCHANGE SYSTEM
- Created by: germaineconroy
- Created on: 03-02-18 20:42
View mindmap
- 6.6 Structure of the human GE system
- Aerobic org req const supply O to release NRG (ATP) during resp
- CO2 prod in resp proc need removed as build-up = harmful
- Mammalian lungs
- Lungs inside body bc air not dense enough to sup + body would dry out (lose water)
- Ribcage supports + protects
- Lungs - lobed struc - series highly branched tubules (bronchioles) - end in tiny air sacs (alveoli)
- alveoli - minute air sacs - end bronchioles - btwn r collagen + elastic fibres. + lined w epithelium. elastic fibres allow alveoli 2 strechas fill during breathing in, spring back during breathing out to expel CO2.
- Alveolar membrane = GE S
- alveoli - minute air sacs - end bronchioles - btwn r collagen + elastic fibres. + lined w epithelium. elastic fibres allow alveoli 2 strechas fill during breathing in, spring back during breathing out to expel CO2.
- Trachea - flexible airway. Sup by ring cartilage - prevent collapsing as air pressure inside falls (breathing in). Tracheal walls made of muscle, lined w epithelium & goblet cells.
- Bronchi - 2 divisions trachea, each leading to other lung. Sim in struc t trachea. They also prod mucus - trap dirt particles + cilia moves dirt-laden mucus towards throat.
- Aerobic org req const supply O to release NRG (ATP) during resp
- maintain high body temp which related high metabolic + respiratory rates
- So, mammals evolved specialised exch surf: lungs
- relatively large org w/ large vol living cells
- Volume O that has to be abs and vol CO2 removed large in animals bc
- relatively large org w/ large vol living cells
- CO2 prod in resp proc need removed as build-up = harmful
- So, mammals evolved specialised exch surf: lungs
Comments
No comments have yet been made