BIOL 031 Lecture Notes - Lecture 28: Perfusion, Partial Pressure, Vasoconstriction
17 Sep 2020
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Total pulmonary ventilation (about 6 l/min) rate x tidal volume. Alveolar ventilation (4. 5 l/min) rate * (tidal volume - dead space) Reduced blood flow at rest lung apex capillaries close at rest and saves energy. Low [o2] in alveoli vasoconstriction of arteriole. Gasses are transported in the blood and exchanged between the blood and tissues. Oxygen and carbon dioxide are exchanged between the air and the blood in the alveoli. They are exchanged with the tissues in the capillaries of the tissues. Oxygen concentrations are high in the blood from the lungs to the tissues. Oxygen concentrations are low in the blood from the tissues to the lungs. Carbon dioxide concentrations are low from the lungs to the tissues. Carbon dioxide concentrations are high from the tissues to the lungs. Air is a mix of gasses, each diffuses independently. Partial pressure of that gas (example: po2 =156 mm hg)
