They bind to special receptors at the site of injury, get activated, and aggregate to form clumps that plug the injury. They do so by adhesion, activation, and aggregation in response to vascular injuries. Platelets function to stop bleeding by creating blood clots through a process called thrombogenesis. Monocytes and neutrophils are phagocytic, while lymphocytes, (B cells, T cells, and NK cells) have other immune related functions. They are of five different types: neutrophils, eosinophils, basophils, lymphocytes, and monocytes. They are found throughout the blood and lymphatic system. White blood cells protect the body against infectious. As per one estimate, a human being makes 2.4 million erythrocytes every second, through a process known as erythropoiesis. They live for only 100–120 days, and therefore, need to be produced constantly. RBCs are able to do this by binding oxygen to iron-containing compounds called hemoglobin, which is responsible for their red color. Red blood cells are the most common blood cells and aid in transporting oxygen to the tissues for respiration, and carbon dioxide from the tissues back to the lungs for expulsion. Human blood contains 200 to 500 thousand platelets in one ml of their blood.Human blood contains 4 to 11 thousand white blood cells per ml of blood.Females contain 4 to 5.5 million red blood cells per ml of their blood.Males contain 4.5 to 6 million red blood cells per ml of their blood.Leukocytes (also called white blood cells or WBCs) Erythrocytes (also called red blood cells or RBCs)Ģ. The formed elements of the blood comprises of three components:ġ. Blood cells are formed in the bone marrow of the long bones and in the lymph nodes. These cells are also called corpuscles or formed elements. 55% of blood volume is plasma and 45% comprises of cells and solid constituents. Some look like they have a hole in the middle, but this is due to the thin area of the biconcave shape that allows for flexibility. See Figure 2.5 below and notice the numerous, round, pink cells in the background each of the leukocyte images. Human blood is made of different type of cells suspended in a solution called plasma. Formed Elements of Blood Erythrocytes (Red Blood Cells) Erythrocytes.
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