Human Body — Page 4

Body temperature varies throughout the day.

Body temperature is not constant. It is lowest in the morning, around 4 a.m., and highest in the late afternoon. This…

A mutation in the LRP5 gene can make bones extremely dense and difficult to break.

A mutation in the LRP5 gene can make bones extremely dense and hard to break. People with this mutation rarely suffer…

The pineal gland produces melatonin, the sleep hormone.

The pineal gland, located in the centre of the brain, produces melatonin, a hormone that regulates the sleep-wake…

The thyroid has the shape of a butterfly.

The thyroid is an endocrine gland located in the neck, shaped like a butterfly or a shield. It produces hormones that…

The left ventricle of the heart is the strongest chamber.

The left ventricle of the human heart has a muscular wall about three times thicker than the right ventricle. This is…

The liver filters about 1.4 litres of blood per minute.

The human liver is one of the most active organs in the body. Every minute, it filters about 1.4 litres of blood…

The human small intestine is about 7 metres long.

The human small intestine is about 7 metres long, divided into the duodenum, jejunum and ileum. The villi inside…

Blinking helps clean and lubricate the cornea.

Each blink spreads a film of tears over the cornea, removing dust and microorganisms and keeping the eye surface…

The hyoid bone is the only bone in the human body that is not connected to any other bone.

The hyoid bone, located at the base of the tongue, does not articulate directly with any other bone. It is supported…

The interstitium is a new human organ discovered in 2018 that runs throughout the body.

The interstitium is a network of fluid-filled spaces between tissues, present under the skin and between organs…

The muscle that tries to move human ears still activates when we try to hear something difficult.

The auricular posterior muscle, an evolutionary vestige, contracts when we make an effort to hear difficult sounds…

The human brain itself has no pain receptors, which allows awake brain surgery to be performed without causing pain to the brain tissue.

Although the brain processes pain signals from all over the body, the brain tissue itself lacks nociceptors, allowing…

Human lungs are the only organs in the body that float in water because they contain air.

Even after exhalation, the lungs retain about a liter of residual air, making them less dense than water and allowing…

The smallest bone in the human body is the stapes, located in the middle ear.

At only two to three millimeters long, the stapes is crucial for hearing as it transmits sound vibrations from the…

The femur is the strongest and longest bone in the human body.

Located in the thigh, this bone supports the body's weight and is so strong that it takes a high-force impact, such…

The human body contains enough fat to make approximately seven bars of soap.

The average body fat of an adult is about fourteen kilograms, and the fatty acids present in that fat can be…

Humans produce enough saliva in their lifetime to fill two average-sized swimming pools.

Salivary glands work continuously to produce between one to two liters of saliva per day, essential for digestion…

Human blood vessels, if laid end to end, would circle the Earth twice.

The circulatory system is a vast network of arteries, veins, and capillaries that, in total, measures about one…

The human eye can process thirty-six thousand bits of information every hour.

The eyes send continuous and complex signals through the optic nerve to the brain, which interprets millions of…

The human skull is made up of twenty-two distinct bones.

These bones include the cranial bones that protect the brain and the facial bones, which fuse or articulate to form…

The human sense of smell is strongest in the morning.

After a night of rest, olfactory receptors are more sensitive and the brain is more rested, allowing for sharper…

The muscles that move your eyes are the most active muscles in your body.

These muscles perform over one hundred thousand coordinated movements per day to allow focusing, tracking objects…

The human liver performs over five hundred vital functions.

From detoxifying the blood and producing bile to storing vitamins and regulating metabolism, the liver is one of the…

Human hair grows faster in the summer than in the winter.

Increased blood circulation and greater exposure to sunlight during the warmer months stimulate hair follicles…