Frog blood in liver blood vessel, SEM

Frog blood in liver blood vessel, SEM

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Caption: Scanning electron micrograph (SEM) Frog blood in liver blood vessel (coqui, Eleutherodactylus coqui). Frog's 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: x240 when shortest axis printed at 25 millimetres.

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