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13 Cards in this Set
- Front
- Back
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what does ventilation involve?
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inspiration and expiration |
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what controls the movement of ventilation?
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intercostal muscles ribcage |
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what happens during inspiration?
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ribcage moves up and out diaphragm flattens increasing the volume of the thorax lung pressure decreases air flows into the lungs |
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what happens during expiration?
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ribcage moves down and in diaphragm becomes curved again thorax volume decreases air pressure increases above atmospheric air is forced out |
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define tidal volume
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the volume of air in each breath |
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define vital capacity |
the maximum volume of air that can be breathed in or out |
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define breathing rate |
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define oxygen uptake |
the rate at which a person uses up oxygen |
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what is a spirometer? |
a machine that gives readings of tidal volume, vital capacity , breathing rate and oxygen uptake
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describe the spirometer
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oxygen filled chamber with a movable lid contains soda lime |
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describe what happens when you breath into a spirometer |
the data is recorded by a pen attached to the lid recorded on a rotating drum |
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what does a spirometer create? |
spirometer trace |
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name 2 reasons why the volume of the gas decreases over time in a spirometer?
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oxygen is used up is respiration |
