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Is the flow in the giraffe's jugular vein a "free" fall?

H S Badeer1

  • 1Department of Biomedical Sciences, Creighton University School of Medicine, Omaha, NE 68178, USA.

Comparative Biochemistry and Physiology. Part A, Physiology
|December 24, 1997
PubMed

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Blood is pumped by the heart into the aorta, the largest artery in the body, and then into increasingly smaller arteries, arterioles, and capillaries. The velocity of blood flow decreases with increased cross-sectional blood vessel area. As blood returns to the heart through venules and veins, its velocity increases. The movement of blood is encouraged by smooth muscle in the vessel walls, the movement of skeletal muscle surrounding the vessels, and one-way valves that prevent backflow.
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Steady Flow of a Fluid Stream

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