What is the purpose of white blood cells in human body?

Answer: The purpose of white blood cells in the human body is to defend against infections and foreign substances.

Some extra relevant information:

White blood cells, also known as leukocytes, play a crucial role in the immune system of the human body. These specialized cells are responsible for defending the body against harmful foreign invaders such as bacteria, viruses, and parasites. While red blood cells are essential for carrying oxygen to various tissues, white blood cells focus on protecting the body from infections and diseases.

White blood cells are produced in the bone marrow and are found circulating throughout the bloodstream and lymphatic system. They are equipped with the ability to recognize and distinguish between the body’s own cells and foreign substances. When an infection or injury occurs, these cells quickly migrate to the affected area to initiate an immune response.

The primary purpose of white blood cells is to identify and destroy pathogens and foreign particles. They achieve this through various mechanisms. One such mechanism is phagocytosis, where certain white blood cells engulf and digest invading microorganisms. These cells include neutrophils and macrophages, which are highly effective in engulfing and neutralizing bacteria.

Another type of white blood cells, known as lymphocytes, play a vital role in adaptive immunity. Lymphocytes are involved in recognizing specific antigens, which are unique markers present on the surface of invading pathogens. This recognition triggers a specific immune response against the particular antigen, allowing the body to mount a targeted defense. There are two main types of lymphocytes: B cells, which produce antibodies that neutralize pathogens, and T cells, which directly destroy infected cells.

White blood cells also release chemical signals called cytokines, which help regulate and coordinate the immune response. These signaling molecules facilitate communication between different immune cells and activate additional immune responses to eliminate the specific threat.

Maintaining a healthy balance of white blood cells is essential for a properly functioning immune system. An abnormal increase or decrease in white blood cell count can indicate underlying health issues. A high white blood cell count, known as leukocytosis, may indicate an infection or inflammation, whereas a low white blood cell count, called leukopenia, can be a sign of certain infections, autoimmune disorders, or even certain medications.

In summary, the purpose of white blood cells is to safeguard the body against infections and diseases. Through mechanisms like phagocytosis, antigen recognition, and cytokine release, these cells form a critical part of the human immune system and are essential for maintaining overall health and well-being.

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