What happens to intercostal and diaphragm muslces in inspiration?
They contract during inspiration
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What happens to the ribcage during inspiration?
Ribcage moves upwards and outwards which causes the diaphragm to flatten so there is an increase in volume of the thorax therefore the pressure decreases (below atmospheric pressure)
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Does the air flow in or out of the lungs during inspiration?
The increase in volume of the thorax causes the air to flow into the lungs
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Is inspiration an active or passive process?
It is an active process-requires energy
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What do the external intercostal and diaphragm muscles do during expiration?
They relax during expiration
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What happens to the ribcage during expiration?
The ribcage moves downwards and inwards and the diaphragm becomes curved again so volume in the thorax decreases causing the air pressure to increase (above atmospheric pressure)
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Does the air flow in or out of the lungs during expiration?
A decrease in volume means the air is forced out of the lungs
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Is expiration an active or passive process?
It is a passive process-does not require energy
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Can expiration be forced?
Yes, during forced expiration the internal intercostal muscles will contract to pull the ribcage down and in
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Other cards in this set
Card 2
Front
What happens to the ribcage during inspiration?
Back
Ribcage moves upwards and outwards which causes the diaphragm to flatten so there is an increase in volume of the thorax therefore the pressure decreases (below atmospheric pressure)
Card 3
Front
Does the air flow in or out of the lungs during inspiration?
Back
Card 4
Front
Is inspiration an active or passive process?
Back
Card 5
Front
What do the external intercostal and diaphragm muscles do during expiration?
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