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Ventilation - Coggle Diagram
Ventilation
Ventilation is the movement of air through the conducting passages between the atmosphere and the lungs. The air moves through the passages because of pressure gradients that are produced by contraction of the diaphragm and thoracic muscles.
During exercise the requirement for oxygen increases due to respiration occurring in the muscles.
Ventilation needs to increase supply more oxygen so the accessory muscles are also used in both inspiration and expiration.
Inspiration
The external intercostal muscles are on the outside of the rib cage, between the ribs.
They are attached at an angle so when they contract the ribs are pulled up.
Intercostals muscles and diaphragm contract, volume of chest cavity increases, pressure in chest cavity decreases and the Air moves into lungs
The diaphragm muscles are at the edge of the diaphragm.
When they contract the centre of the domed diaphragm is pulled flatter.
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Expiration
When you breathe out, the external intercostal and diaphragm muscles relax, so the rib cage and diaphragm return to their starting positions.
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Intercostal muscles and diaphragm relax, elastic fibres in lungs recoil, volume of air in lungs decreases, pressure increases and the Air moves out
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