Discuss nature and role of platelets and lymph.

PLATELETS: Platelets or thrombocyte are the fragments of cytoplasm derived from the megakaryocytes of bone marrow. As they are just fragments they do not have a nucleus or any genetical material. They are formed in bone marrow and enter the blood circulation. The role of platelets is they Secrete vasoconstrictors which constrict blood vessels, causing vascular spasms in broken blood vessels, Form temporary platelet plugs to stop bleeding.,Dissolve blood clots when they are no longer needed.

LYMPH: The colorless fluid which circulates through lymphatic system is called as lymph. Lymph contains a variety of substances, such as proteins, salts, glucose, fats, water, and white blood cells. Unlike your blood, lymph does not normally contain any red blood cells. The role of lymph is it returns proteins and excess interstitial fluid to the bloodstream. It also transports fats from the digestive system to the blood via chylomicrons.