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Question: Human nerves cannot be reconnected if they are severed.
Answer: Some nerves, such as optic and spinal-cord nerves, are so specialized that they have very limited powers of regeneration. But other nerves can be easily reconnected and even regain feeling.
Question: The fluid in the lympathic system is pumped by the heart.
Answer: The heart pumps blood. Lympathic fluid is pumped by a process called peristalsis, the contraction of muscles around the lymphatic vessels.
Question: Human skin cells divide only once.
Answer: Human skin cells divide between 50 and 70 times.
Question: The human body contains about 1 million neurons.
Answer: Nerve cells, or neurons, are the basic units of the nervous system. The human body contains billions of neurons. The brain alone contains some 100 billion neurons.
Question: A typical adult human head weighs 20 kilograms.
Answer: A typical adult human head weighs about 5 kilograms. The brain accounts for about 1-1.5 kilograms.
Question: Sitting on "pins and needles" involves the nerves.
Answer: The sensation that we’re being pricked by pins and needles is a phenomenon called paresthesia. This is commonly caused by compressed nerves that run between the bones and the skin.
Question: People choose to be left-handed or right-handed.
Answer: We are born with genes programmed for handedness. About 90 percent of people are right-handed. A very small number of people are ambidextrous—that is, they can use both hands equally.
Question: Humans and apes share only a small number of genes.
Answer: More than 98 percent of human DNA is identical to that of chimpanzees, gorillas, and other apes. The remaining quantity contains what distinguishes us.
Muscles of forearm (posterior view), human anatomy, (Netter replacement project - CMM). Forelimb, upper limb, appendage, human forearm, human arm, triceps, biceps, human hand, body part.

The Human Body: Fact or Fiction?

Encyclop?dia Britannica, Inc.
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