Question

Summarize what Alveolar Partial Pressure is and how Volume and Pressure relate to breathing.

Answer 1

Partial pressure is the force exerted by a gas and the sum of the partial pressures of all the gases in a mixture equals the total pressure. So, partial pressureis extremely important in predicting the movement of gases.

The partial pressure of oxygen in alveolar air is about 104 mm Hg while the partial pressure of the oxygenated pulmonary venous blood is about 100 mm Hg. Oxygen enters the alveoli at a high rate, and the partial pressure of oxygen in the alveoli remains high when the ventilation is sufficient.

The relationship between gas pressure and volume helps to explain the mechanics of breathing by Boyle's Law which is the gas law which states that in a closed space,pressure and volume are inversely related. ie, as pressure increases, voulume decreases and vice versa.

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