7 Interesting Facts about Human Body

The human body has always been an interesting case study for scientists. With the passage of time, as science and technology evolved, more and more discoveries have been made about the human body. But still, we are far from knowing the ‘full facts’ about our bodies. However, what facts have been discovered so far, are still as interesting and intriguing as the areas that need to be unveiled yet.

A few of these interesting facts about the human body have been explored here.

Human Brain Does Not Shut Off

When we fall asleep our brain does not shut off. It remains active to perform certain tasks that make up the different levels of sleep.

During the first stage, muscles and eyes are relaxed along with a decrease in heart rate, blood pressure, and body temperature. This stage is called ‘slow wave sleep’ or SWS. Then the brains’ activities change drastically as sleep moves to the next phase called REM – rapid eye movement. This is also the active dreaming phase in which heart rate, blood pressure, and body temperature change from time to time. However, muscles are in a sort of paralysis except for the ones controlling breathing and eye movements.

All these activities during sleep cause the brain to perform different activities depending upon the phase it is going through.

Our Body Emits Light

Our bodies emit light that is not visible to the naked eye. The light is 1000 times less intense than the levels to which our eyes are sensitive.

Different researches also show that the face glows more than the rest of the body as it is more exposed to the sunlight, thus skin texture is more tanned.

Through recent research, it has been proven that the light emission level is not the same throughout the span of a day. This is because of the metabolism changes taking place throughout the day.

Newborn Babies Do Not Shed Tears

Newborn babies do not shed tears until they are a few weeks old. This is because the tear ducts and glands are not fully developed, though working, so the production rate of tears is very low. The tears produced at this stage only moisturize the eyes, but we don’t see them rolling down. The glands develop more as babies reach the age of one month, leading to an increase in the tear production rate.

Human Lungs are Different in Size

The lungs in the human body are not of the same size. The left lung is smaller than the right one. It is because both lungs are providing space for their neighboring organs. The right lung is a bit squeezed length wise so that the liver right beneath it can fit in. Similarly, the left lung is making room for the heart therefore it is narrow and small.

Human Teeth vs Shark Teeth in Strength

Though human teeth are mainly composed of mineral (i.e. hydroxyapatite) softer than the ones found in shark’s teeth (i.e. fluoroapatitel), they are just as strong. However, the structure as in how these teeth are layered and how human teeth suffer ‘tooth decay’, makes the teeth set differently for both individuals in shape and use. This may make the shark teeth look sharper and more vicious but does not make them any stronger than human teeth.

Human Body Weight is 8% of Blood

The weight of the human body has about 8-10% blood. The average blood volume in an adult body is 5.5 liters. It contains about 3 liters of plasma, red blood cells, white blood cells, and platelets. As blood is assisting in almost all bodily functions, it contains vitamins, electrolytes, iron, and other nutrients which are carried to the body’s cells and organs. It also carries elements that need to be excreted from the body.

Humans Shed About 4kg of Skin Cells

Our skin is composed of several layers. The layer that we see is called the epidermis. New cells are constantly being formed under this later. The new skin cells slowly move toward the top layer. This process takes about two weeks to a month, and it is repeated constantly. As the new cells reach the top, old skin cells die and rise to the surface of the skin, then break away from the epidermis and fall off. With this, the new skin cells take their place and a new layer of skin is formed all over. About 40000 cells (almost 4 kg) are shed off yearly during this process.

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