A hemocytoblast is a type of stem cell that produces blood cells. When a hemocytoblast divides into two daughter cells, one of the new cells becomes a blood cell. The other remains a hemocytoblast, ensuring there are always enough hemocytoblasts available.
Hemocytoblasts produce three types of blood cells: white blood cells, red blood cells and platelets. White blood cells play an important role in helping the immune system fight infections. The human body contains several types of white blood cells. As monocytes mature, they leave the blood and enter the tissue. They eventually become macrophages, which are cells that engulf disease-causing organisms.
Neutrophils fight infection by digesting bacteria. Lymphocytes contain B and T cells, which play different roles in the immune response. B cells produce antibodies that bind to foreign substances, while T cells secrete chemical signals that tell other immune cells to attack harmful substances. Red blood cells are necessary for survival because they carry oxygen throughout the body. This ensures every cell receives the oxygen it needs to function. Platelets are cell fragments that help blood clot normally. They gather at the site of an injury and work with vitamin K, calcium and fibrinogen, a protein, to form a clot and stop the bleeding. People with low platelet levels have an increased risk of excessive bleeding following injuries or surgical procedures.