(AQA GCSE B3.1.2) Gaseous Exchange in the Lungs
- Created by: Em
- Created on: 17-04-13 17:39
View mindmap
- Gaseous Exchange in the Lungs
- The THORAX is the upper part of the body (chest, etc.), the ABDOMEN is the lower part (stomach, etc.) Between these is a muscle called the DIAPHRAGM.
- The diaphragm lies below the lungs.
- When breathing in, the INTERCOSTAL MUSCLES between the ribs contract, causing the ribs to move upwards and outwards.
- As well as this, the diaphragm contracts. It becomes a more horizontal shape below the lungs.
- These cause the lungs to expand, they have a higher volume and low pressure. This low pressure is unbalanced with the higher pressure outside the lungs, and therefore air is drawn in
- As well as this, the diaphragm contracts. It becomes a more horizontal shape below the lungs.
- When breathing out, the intercostal muscles relax. The ribs move back down.
- The diaphragm also relaxes, it becomes more of a curve.
- The THORAX is the upper part of the body (chest, etc.), the ABDOMEN is the lower part (stomach, etc.) Between these is a muscle called the DIAPHRAGM.
- This causes the opposite effect to breathing in. The volume decreases and the pressure increases, causing air to be pushed out
- The diaphragm also relaxes, it becomes more of a curve.
Comments
No comments have yet been made