Answer: The primary function of platelets is to from blood clots. The formation of these blood clots help to control bleeding so there is not too much blood loss. To form a blood clot, platelets clump together using fibrinogen as an adhesive.
Answer: The primary function of insurance company is to provide protection from adverse events. The insurance companies accept premium payments in exchange for companies in the eventthat certain specified but undesirable, event occure.
Answer: Melanin is a pigment in the skin of animals (including humans). Melanin is essentially what allows the human body (the skin) to darken when sunlight (or, ultraviolet rays) hits it. The skin absorbs the UV rays and the melanin allows the skin to become darker.
A simpler definition:
Any of a group of naturally occurring dark pigments, especially the pigment found in skin, hair, fur, and feathers.
Answer: T- lymphocytes are the "Generals of the immune system" and direct much of the immune response. Their biggest role is in telling B lymphocytes to make antibodies but they also have other functions.
Answer: I think you mean lymphocytes. The B and T cells are lymphocytes that are responsible for destroying unwanted viruses and bacteria in your body. They are cells of the immune system. These cells are found in the lymph nodes.