Frog red blood cells. Light micrograph of red blood cells (red) from a frog. These cells (also called erythrocytes) carry oxygen around the body, using the red pigment haemoglobin. Non-mammalian red blood cells (such as those of a frog) are oval in shape and contain a cell nucleus (black). Human red blood cells are disc-shaped and do not have a cell nucleus. Frogs are also cold-blooded, meaning they rely on external heat to warm their blood, as opposed to mammals, who can generate their own internal heat supply. Magnification: x285 when printed 10cm wide.
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