Optional

Leukocytes



Lymphocyte: Spherical-core leukocyte type

What are leukocytes - definition

Leukocytes, also known as white blood cells, are cells present in the blood and produced in the bone marrow and lymphatic tissue. They are called white blood cells because, unlike red blood cells (red blood cells), they have no pigments.

Leukocyte Function in the Body

- Perform the body's defense against infectious agents (viruses, bacteria and allergenic substances). This process occurs because leukocytes have the ability to produce antibodies.

Main Features:

- They have spherical shape;

- They have white color;

- They have a size between 7 and 20 micrometers (they are visualized only with powerful microscopes);

In the human body of a healthy person there are between 4,000 and 11,000 leukocytes per milliliter of blood. However, in a person with infection, the number of white blood cells can reach 30,000 per ml of blood.

Leukocyte Classification

Leukocytes can be classified according to the shape of the nucleus.

Mononuclear Leukocytes:

- Lymphocytes: have spherical nucleus. They are mainly located in the lymphoid organs.

- Monocytes: are generated in the bone marrow. They have bluish cytoplasm. It is the largest among leukocytes (up to 20 micrometres).

Polymorphonuclear Leukocytes:

- Basophils: nucleus with the letter "S" format. Produced in the bone marrow. Among leukocytes is the type found in smaller numbers.

- Neutrophils: have light pink cytoplasm. It is the largest in human blood (from 50 to 70%). They have granules in their cytoplasm.

- Eosinophil: It is produced in the bone marrow and has granules in its cytoplasm.

Biological Curiosities:

A person's human body can produce up to 100 million leukocytes per day.

- In pus there is a large amount of dead leukocytes because they acted on the infection and died. Therefore, the existence of pus is an indication that an infectious process is taking place in the body and that the immune system, through the leukocytes, is acting.

Reducing the number of leukocytes in a person's blood is known as leukopenia.