25157B

25157B
Caption: Frog blood (coqui Eleutherodactylus coqui). Frogs have nucleated red blood cells. In the amphibian circulatory system blood accumulates oxygen in the lungs and is then returned to the heart before being pumped through the rest of the circulatory system. Mixing between oxygenated and deoxygenated blood occurs as blood returning to the heart from the lungs is mixed with incoming blood from the body. Frogs depend on cutaneous respiration for their oxygen supply. In this process oxygen from the air is drawn into a frogs body by the blood vessels that lie close to the skin. Waste gas and carbon dioxide are also released the same way.
Magnification*: x440
Type: SEM
Copyright 2009 Dennis Kunkel Microscopy, Inc.
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