Respiratory Causes Of Hypoxemia

Under normal conditions, hemoglobin is 100% saturated with oxygen when the blood leaves the pulmonary capillaries, and the end-capillary Po2 equals alveolar Po2. However, the blood that leaves the lungs (via the pulmonary veins) and returns to the left side of the heart has a lower Po2 than pulmonary end-capillary blood. As a result, the systemic arterial blood has an average oxygen tension (Pao2) of about 95 mm Hg and is only 98% saturated.

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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