- Messages
- 310
- Reaction score
- 125
- Points
- 53
Trachea- C shaped windpipe with cartillagewhat did to guys write about the respiratory system
Bronchus-Structures with smooth muscles and some cartillage
Bronchiole-Does not contain cartillage and smooth muscle
Alveoli- Greater surface area for gaseous exchange, contains elastic fibres and collagen. Elastic fibres stretch to allow greater diffusion of gases