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Lungs become less elasc inspiratory capacity dal irv

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Unformatted text preview: Volume change together P1V1 = P2V2 3. Total pressure of a mixture of gases is sum of the pressures of the individual gasses At sea level, atmospheric pressure is 760mm Hg, oxygen is 21% of atmosphere, so par(al pressure of oxygen is 160mm Hg Gases move from places of high concentra(on/pressure to low concentra(on/pressure (applies to single gases) Ven(la(on •  Pulmonary func(on tested using a spirometer, instrument that measures the volume of air moved with each breath Ven(la(on •  Air moved during breathing can be divided into four lung volumes –  Tidal volume •  Breathe quietly (500mL) –  Inspiratory reserve volume •  Now at the end of a quiet inspira(on, take in as much addi(onal air as you possibly can (about 3000mL) –  Expiratory reserve volume •  Now at the end of a normal exhala(on, exhale as much air as you possibly can (1100 mL) –  Residual volume •  Air remaining in lungs aher maximal exhala(on (about 1200 mL), exists because lungs are held stretched against ribs Ven(la(on Key Terms •  Vital capacity is sum of the inspiratory reserve volume and expiratory reserve...
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