The Human Skeleton
The human skeleton is the internal framework of bones that supports the body, protects its organs, and allows it to move. An adult skeleton has 206…
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The Human Eye
The human eye is the organ of sight, a remarkable structure that turns light into the images we see. Roughly the size of a ping pong ball, it…
The Human Brain
The human brain is the command centre of the body and the most complex object known in the universe. Weighing only about 1.4 kilograms, it contains…
The Human Heart
The human heart is a muscular pump, roughly the size of a clenched fist, that drives blood through the body every moment of life. Beating around…