intercostal and diaphragm muscles contract ribcage upwards and outwards diaphragm flattens increased volume of the thorax lung pressure decreases causes air to flow in active process
3 of 9
what happens during expiration
intercostal and diaphragm muscles relax ribcage moves downwards and inwards diaphragm becomes curved again thorax volume decreases air pressure increases air forced out passive
4 of 9
what are alveoli walls made from
alveoli epithelium and elastin
5 of 9
what factors do the alveoli have to make exchange quick
thin exchange surface 1 cell thick, large surface area lots of them and a constant high concentration gradient
6 of 9
what is meant by tidal volume
volume of air in each breath
7 of 9
what is meant by ventilation rate
the number breaths per minute
8 of 9
whats a spirometer
a machine that measure the volume of air breathed in and out
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