Goose bumps are a vestige from the days when humans were covered with hair. When it got cold, the hairs stood on end, creating a trap for air and providing insulation. The hairs have long since disappeared, but in the places where they used to be, the skin still bristles, trying to get warm.
The hyoid bone resides by itself in the throat and does not connect with other bones. It supports the tongue and its muscles.
The small intestine, which is contained in the central and lower abdominal cavity, is 20 to 23 feet long. The large intestine is 5 feet long.
On September 16, 1921, a baby boy in Shoreditch, East London, England, was reported to have been born with 14 fingers and 15 toes.
A human fetus develops fingerprints at the age of three months.
The average body has 14 to 18 square feet of skin.
Strong and light, the skeleton of the average person accounts for less than 20 percent of body weight.
We drink about 16,000 gallons of water in a lifetime.
The Adam’s apple refers to a legend that claims a piece of the forbidden fruit stuck in Adam’s throat. This part of the throat is actually a projection of the thyroid cartilage of the larynx.
The sensation, called neurapraxia, usually occurs when a nerve is compressed between a bone and another hard object. Blood continues to circulate through the affected area.
A human embryo has its first heartbeat at the age of three weeks, when the heart of the embryo looks like a tube. As it begins to beat, it starts the blood circulating through the few blood vessels that have formed around it.
Newspaper columnists and others have claimed that the body’s chemical worth is between 98 cents and $5. But one doctor argues that, at the rates currently charged by large chemical distributors, the body’s worth is at least $169,834, not counting $1,200 worth of blood. The key is to market the body’s products intelligently and not […]
Most men’s bodies are composed of about 40 percent muscle. Women’s bodies are 30 percent muscle.
About 100,000 hairs are on a human head. Human hairs grow about 0.01 inch every day.
The apple of one’s eye is the pupil, which was likened to an apple because, in the ninth century, it was believed to be a solid round mass.
No. Identical twins do not have the same fingerprints.
The skin on the foot or palm of the hand wrinkles when exposed to water because it expands. The thick, hardened layers of skin swell as water is retained.
Smiling is easier on the face than frowning. It takes 17 muscles to smile and 43 to frown.
Broca’s area is the part of the brain associated with motor control of speech. It is usually located in the left but sometimes in the right inferior frontal convolution. It is named after its discoverer, the nineteenth-century French surgeon Paul Broca.
A gamete is a mature, functional sex cell (i.e., an egg or sperm) that can unite with a gamete of the opposite sex. A zygote is what results when the two gametes fuse.
There are about 200 million to 300 million sperm cells are contained in an average human ejaculation. Yet sperm cells make up only 2 to 5 percent of total sperm volume. The rest is composed of fluids, known as seminal plasma, that help keep the sperm cells alive.
A knockout punch causes a chain reaction in the victim’s circulatory system. The supply of blood pools in the abdomen, reducing circulation to the brain, and resulting in loss of consciousness.
Yes. There are three gluteus muscles, the large, fleshy muscles of the buttocks that connect the hipbone (the pelvic girdle) and the thighbone (the femur). The gluteus maximus is the muscle at the surface of the buttocks, below which is the gluteus medius. The gluteus minimus is below that.
Whether the person is male or female, the number of hairs lost is the same, about 25 to 125 hairs. These are replaced by new hairs, unless the person starts balding.
Your mother was right. You lose about half to three-fourths of heat from your head.
Balding occurs when hair follicles shrink and become less productive. Instead of the new hairs being cultivated to replace the ones that fall out naturally each day, they are allowed to remain embryonic, at the most, in a light, peach-fuzz stage. Probably some hormonal action triggers the follicles to behave this way, but it is […]
Fingerprints provide traction for your fingers, helping you to grasp things.
The longest hiccuping attack lasted 65 years. The longest sneezing fit lasted 978 days. The longest yawning ordeal took five weeks.
No, long-term constipation does not cause poisoning. There are several cases on record in which fecal material has been stored in the bowels for over a year without causing any ill effects. Aside from the discomfort of carrying around an extra 60 to 100 pounds of weight.
Assuming that the heart beats at least once a second, by the time a person is 70, his or her heart will have beat at least 2.8 billion times.