What is the most common type of leukocyte in the blood?

What is the most common type of leukocyte in the blood?

• A. Lymphocytes
• B. Eosinophils
• C. Neutrophils
• D. Monocytes

Answer: (C)

Neutrophils are recognized as the most common type of leukocyte in the blood, making up approximately 55-70% of the total white blood cell count in a healthy adult. They play a crucial role in the immune response, particularly in the body’s defense against infections, especially those caused by bacteria. Neutrophils are often the first responders to sites of infection or injury, where they act by engulfing and digesting microorganisms through a process known as phagocytosis. They are characterized by their multi-lobed nucleus and granules that contain enzymes and antimicrobial substances, which are released to help control infectious agents. The other types of leukocytes, such as lymphocytes, eosinophils, and monocytes, serve different functions within the immune system but do not account for the highest proportion of white blood cells. Lymphocytes are primarily involved in adaptive immunity, eosinophils respond to parasitic infections and allergic reactions, and monocytes differentiate into macrophages and dendritic cells that also aid in immune responses but are present in smaller numbers compared to neutrophils.

Neutrophils are recognized as the most common type of leukocyte in the blood, making up approximately 55-70% of the total white blood cell count in a healthy adult. They play a crucial role in the immune response, particularly in the body’s defense against infections, especially those caused by bacteria.

Neutrophils are often the first responders to sites of infection or injury, where they act by engulfing and digesting microorganisms through a process known as phagocytosis. They are characterized by their multi-lobed nucleus and granules that contain enzymes and antimicrobial substances, which are released to help control infectious agents.

The other types of leukocytes, such as lymphocytes, eosinophils, and monocytes, serve different functions within the immune system but do not account for the highest proportion of white blood cells. Lymphocytes are primarily involved in adaptive immunity, eosinophils respond to parasitic infections and allergic reactions, and monocytes differentiate into macrophages and dendritic cells that also aid in immune responses but are present in smaller numbers compared to neutrophils.