Amazing facts of blood


One pint of donated blood can save three lives.


Someone in America needs blood every two seconds.

A newborn baby has a cup of blood in its body.

Blood is a liquid connective tissue.

Blood is made up of two components 1. Blood plasma 2. Blood corpuscles

Blood is of three types on the basis of structure and function- 1.RBC 2.WBC 3.Blood platelets

The life of RBC is 120 days in the human body.

The number of RBCs in humans ranges from 5 to 5.5 lakhs per cubic millimeter.

The shape of RBC is oval.

In our blood only red blood cells are responsible for carrying oxygen.

The color of RBC is due to red hemoglobin.

Red blood cells are special cells in our body. They do not have a nucleus. Since a red blood cell has no nucleus, it cannot multiply through cell division because a nucleus is necessary to undergo cell division. Thus, red blood cells die after 120 days.


The life span of WBC is about 8 to 10 days in the human body.

Blood plasma is mainly composed of water. 90% of blood plasma is water.

Blood plasma contains hormones, glucose, proteins, gases, electrolytes and nutrients.

Platelets, white blood cells and red blood cells are all found floating in the blood plasma

Dengue disease occurs due to low platelet count, because the dengue virus eats the platelets.

A normal human body contains 5 to 6 liters of blood.

Black ink from HP Printer is more expensive than blood.

Blood is consumed by only female mosquitoes, male mosquitoes are herbivores.
You have about 0.2 milligrams of gold in your bloodstream.

An adult human body has 100,000 miles of blood vessels.

The formation of blood takes place in the bone marrow in humans. In the fetal stage, blood is produced by the liver and spleen.

Coconut water (in emergencies) can be used as a substitute for blood plasma.

There are about 0.2 milligrams of gold in our body, most of which is in our blood.


Your blood makes up 8% of your body weight.

The blood of spiders, shrimp and snails is blue in colour.

White blood cells make up 1% of your blood.

More than 38,000 blood donations are required every day.

O(O) blood type is often requested by hospitals.
One pint of blood is capable of saving 3 lives.

Every two seconds, someone in the world will need blood.

An adult body has 100,000 kilometers or 60,000 miles of blood vessels running throughout the body.

A single car accident victim may require around 100 units of blood.

William Harvey was the first to describe blood circulation in 1628.

One out of every 10 people who enter a hospital will need blood.

People with sickle cell disease need 4 pints or units of blood each month to survive.

At least 4 units or pints of blood may be needed to treat cancer.

Victims of serious car accidents need 50 pints or units of blood before their condition returns to normal.

Not everyone willing to donate blood is allowed to do so. People are generally screened for transmissible diseases before they are allowed to donate blood.

The blood may be dark greenish-black in colour. This is usually caused by a type of migraine medication.

The circumference of the Earth is 40,000 kilometers or 25,000 miles. If all the blood vessels in the human body were kept end to end, they could wrap around our earth about 2.5 times!


The world’s first blood bank was opened in Chicago in 1936.

World blood donor day is celebrated on 14 June.


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