Neutrophils help heal damaged tissues and resolve infections. Neutrophil blood levels increase naturally in response to infections, injuries, and other types of stress. They may decrease in response to severe or chronic infections, drug treatments, and genetic conditions.
Neutrophils block, disable, digest, or ward off invading particles and microorganisms. They also communicate with other cells to help them repair cells and mount a proper immune response. The body produces neutrophils in the bone marrow, and they account for 55–70 percent of all white blood cells in the bloodstream.
Lymphocytes help fight disease and infection. They are primarily involved in recognizing and responding to foreign substances, such as viruses and bacteria, with two main types: T cells, which destroy infected cells, and B cells, which produce antibodies to target pathogens.
Monocytes influence adaptive immune responses and exert tissue repair functions. Monocytes are mechanically active cells and migrate from blood to an inflammatory site to perform their functions. In general, monocytes and their macrophage and dendritic cell progeny serve three main functions in the immune system. These are phagocytosis, antigen presentation, and cytokine production. Phagocytosis is the process of uptake of microbes and particles followed by digestion and destruction of this material. Monocytes can perform phagocytosis using intermediary proteins such as antibodies or complement that coat the pathogen, as well as by binding to the microbe directly via pattern recognition receptors that recognize pathogens.
Normally transparent, it is this affinity that causes them to appear brick-red after staining. Eosinophils are responsible for combating multicellular parasites and certain infections in vertebrates. Along with mast cells and basophils, they also control mechanisms associated with allergy and asthma.
Basophils release enzymes to improve blood flow and prevent blood clots. Basophils function to defend your body against:
Stem cells will appear like red cells, but do not clot and display a large white center.
Hematopoietic stem cells (HSC) emanate from bone marrow and can produce all the cells that function in the blood. Stem cells also can become brain cells, heart muscle cells, bone cells or other cell types.
Hematopoietic stem cells (HSC) circulate under steady state conditions in peripheral blood to
i) to maintain a stem cell pool in remote bone marrow locations in the body and
ii) to “patrol” peripheral tissues and organs and, when needed, to respond to organ injuries and infections. The number of these cells increases in stress situations related to infections, inflammation, organ injury as well as after strenuous exercise.
The Neutrophil-Lymphocyte Ratio (NLR) is a significant biomarker used in live blood analysis to assess the balance between neutrophils and lymphocytes, two critical types of white blood cells involved in the body’s immune response. Neutrophils are the first responders to infection or injury, playing a key role in the inflammatory response, while lymphocytes are responsible for adaptive immunity, including the recognition of pathogens and immune memory.
