There is no pump in the lymphatic system like the heart in the cardiovascular system. Like veins, the lymphatic tributaries have thin walls and have valves to prevent backflow of blood. The right lymphatic duct drains lymph from the upper right quadrant of the body. Lymphatic trunks merge until the lymph enters the two lymphatic ducts. Small lymphatic vessels join to form larger tributaries, called lymphatic trunks, which drain large regions. The microscopic lymph capillaries merge to form lymphatic vessels. This arrangement permits fluid to enter the capillary but prevents lymph from leaving the vessel. The wall of the lymph capillary is composed of endothelium in which the simple squamous cells overlap to form a simple one-way valve. Lymph capillaries are found in all regions of the body except the bone marrow, central nervous system, and tissues, such as the epidermis, that lack blood vessels. The smallest lymphatic vessels are the lymph capillaries, which begin in the tissue spaces as blind-ended sacs. Lymphatic vessels, unlike blood vessels, only carry fluid away from the tissues. Returning the fluid to the blood prevents edema and helps to maintain normal blood volume and pressure. As soon as the interstitial fluid enters the lymph capillaries, it is called lymph. As the interstitial fluid begins to accumulate, it is picked up and removed by tiny lymphatic vessels and returned to the blood. It is derived from blood plasma as fluids pass through capillary walls at the arterial end. Lymph is a fluid similar in composition to blood plasma. The lymphatic system consists of a fluid ( lymph), vessels that transport the lymph, and organs that contain lymphoid tissue. Acknowledgements Components of the Lymphatic System
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