Galen: On the Natural Faculties by Galen

2 by Galen, Galen, Brock, Arthur John, 1878-1947

Chapter 44: Chapter XIV

Chapter 44: Chapter XIV

The superficial arteries, when they dilate, draw in air from the atmosphere, and the deeper ones a fine, vaporous blood from the veins and heart. Lighter matter such as air will always be drawn in preference to heavier; this is why the arteries in the food-canal draw in practically none of the nutrient matter contained in it.
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