The Breathing System
- Created by: Jasmin
- Created on: 09-04-13 16:55
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- The Breathing System
- Lungs in thorax
- Lungs protected by ribcage
- Air breathe in and goes in through the trachea
- Splits into two tubes - bronchi (bronchus if one) going into each lung
- Bronchi split into smaller tubes - bronchioles
- At end of bronchioles - alveoli where gas exchange takes place
- Bronchi split into smaller tubes - bronchioles
- Splits into two tubes - bronchi (bronchus if one) going into each lung
- Adaptations for exchanging materials
- Have large SA
- Thin
- Alveoli - large SA, rich blood supply, maintains concentration gradient in both directions
- Breathing in
- Intercostal muscles and diaphragm contract
- Thorax volume increases
- Decreases the pressure, drawing air in
- Breathing out
- Intercostal muscles and diaphragm relax
- Thorax volume decreases
- Increases pressure, air is forced out
- Breathing in
- Intercostal muscles and diaphragm contract
- Thorax volume increases
- Decreases the pressure, drawing air in
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