How Many Types of Blood are there

Red blood cell by entiregrade
Red blood cell by entiregrade

Blood is a fluid which flows in our blood vessels.

Blood is the carrier of the materials for transportation inside the body.

There are three types of blood in our body,

1. Red Blood Corpuscles (RBCs)

2. White Blood Corpuscles (WBCs)

3. Blood platelets

1. Red Blood Corpuscles (RBCs)

Red blood cell

In the human body, the RBCs are circular, binocave and disc-shaped cells.

RBCs have no nuclei in a mature stage.

In adults, they are formed in the bone marrow.

RBC is red in colour due to the presence of the pigments called haemoglobin (Hb).

Haemoglobin contains iron, because of which RBC carry oxygen.

RBCs are formed in the bone marrow and die in liver and spleen.

The life span of RBC is about four months or 120 days.

When the number of RBCs or their content haemoglobin decreases in the body, it leads to a disease called anaemia.

RBCs carry oxygen from the lungs to the body tissue and help in respiration.

2. White Blood Corpuscles (WBCs)

WBCs are colourless and irregular in shape. They have nuclei but no haemoglobin.

They are found in the least number.

WBCs are formed in the yellow bone marrow and lymph nodes.

WBCs are the biggest blood cells and their life span is about 15 days.

They help in the defence of the body by engulfing germs and by producing antibodies.

If the number of WBCs are increasing more in our body, it causes leukaemia or blood cancer.

3. Blood platelets


Blood platelets are the smallest blood cells.

  • They are also produced in the bone marrow.
  • They have no nucleus and their life span is about 3 to 5 days.
  • They play an important role in blood clotting at cuts.

Functions of blood

The main three functions of blood are as follows

a. Transportation

b. Regulation

c. Protection

a. Transportation

Blood carries oxygen from the lungs and supplies to all the tissues.

It carries nutrients to all the parts of the body.

It also carries the wastes from the cells to the related excretory organs.

Blood transports the hormones secreted by body glands to different parts of the body.

b. Regulation

Blood regulates the body temperature and amount of water in the body.

c. Protection

Blood protects the body from diseases.

It also helps in clotting of blood at wounds.

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