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Ventilation

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Ventilation


A key point to remember when thinking about ventilation is that air moves from

high pressure to low pressure. Pressure is directly related to volume. So when

volume increases pressure and decreases and vice versa.

 

During inhalation air moves in. For this to occur the pressure inside the lungs

needs to be lower than outside.

 

To ensure the pressure in the lungs is lower, the diaphragm contracts and

flattens and therefore increases the volume in the lungs. Also the intercostal

muscles, the muscles that surround the rib cage contract, this move the ribs

up and out, therefore allowing the lungs to increase in volume even more.

 

During exhalation air moves out of the body. For this to occur the pressure

inside the lungs has to be greater than outside To ensure the pressure in the

lungs is lower, the diaphragm relaxes and moves upwards back into its original

shape, the intercostal muscles also relax letting the ribs move down. Overall

this makes the volume in lungs decrease and therefore the pressure increases

so air moves out.

 

 InhalingExhaling
Diaphragm Contracts causing it to  flatten Relaxes causing it to  move back to its  original shape
Intercostal Muscles  Contract causing the  ribs to move up and out Relaxes causing the  ribs to move down and  in
Volume of ribcage  increases decreases
Pressure inside the chest decreases increases
Movement of air Air move in to the lungs Air moves out of the  lungs

 

 

Related Topic


Classification                                                Gas Exchange in the Lungs