Giraffes' long necks consist of only seven vertebrae, just like humans, but each vertebra can be over 10 inches (25 cm) long. The neck is supported by powerful muscles and a network of blood vessels that prevent blood from rushing to the head when the giraffe bends down to drink water. Despite their height, giraffes have a relatively small heart that has to pump blood up the long neck against gravity. To compensate for this, giraffes have a very high blood pressure, which is two to three times higher than that of humans.
- Catégories
- MAMMALS
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