Figure 397

Respiratory unit. (Redrawn from Miller WS: The Lung. Springfield, Ill: Charles C Thomas, 1947.)

and the pulmonary blood occurs through the membranes of all the terminal portions of the lungs, not merely in the alveoli themselves. All these membranes are collectively known as the respiratory membrane, also called the pulmonary membrane.

Figure 39-6

Oxygen and carbon dioxide partial pressures in the various portions of normal expired air.

Alveolar sacs

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Essentials of Human Physiology

Essentials of Human Physiology

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