Human Gaseous Exhange System
- Created by: Natasha Granville
- Created on: 15-04-18 10:27
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- Human Gaseous Exchange System
- Trachea
- Cartilage
- support
- strong
- flexible
- incomplete rings
- food can move down oesophagus behind
- Smooth muscle
- contract or relax to alter diameter
- Elastic fibres
- recoil during exhalation
- Goblet cells
- produce mucus
- mucus traps dust and bacteria
- produce mucus
- Ciliated epithelium
- sweep mucus away from lungs
- Cartilage
- Bronchi
- Trachea divides to form 2 bronchi
- structurally similar to trachea
- smaller than trachea
- Bronchioles
- Bronchi divide to form many small broncioles
- No cartilage rings
- smooth muscle
- contracts and relaxes to change amount of air reaching lungs
- Alveoli
- thin walls
- single layer of squamous epithelium
- short diffusion distance
- large surface area
- efficient diffusion
- good blood supply
- surrounded by many capillaries
- Maintain steep concentration gradient of O2 and CO2
- lined with lung surfactant
- dissolves gases
- reduces cohesion of water molecules
- prevent collapse of alveoli during inhalation
- dissolves gases
- prevent collapse of alveoli during inhalation
- thin walls
- Nasal cavity
- good blood supply
- warms incoming air
- hairs
- secrete mucus
- trap dust and bacteria
- secrete mucus
- moist
- increase humidity of incoming air
- reduce evaporation
- increase humidity of incoming air
- good blood supply
- Trachea
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