ANATOMY
LYMPHATIC SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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thick bands of smooth muscle that contract and relax
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flaplike valves that prevent back flow of lymph
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cilia that create currents that flow lymph towards the heart
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lymph nodes that contract and pump lymph towards heart
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Detailed explanation-1: -The lymphatic vessels come together in still-larger tubes called collecting ducts. A series of valves keep the fluid moving one way. The collecting ducts empty the lymph into the right or left lymphatic duct (thoracic duct).
Detailed explanation-2: -Structurally the lymphatic capillaries consist of a continuous endothelium that is extremely attenuated over major aspects of its diameter, except in the perinuclear region which bulges into the lumen.
Detailed explanation-3: -The wall of the lymph capillary is composed of endothelium in which the simple squamous cells overlap to form a simple one-way valve. This arrangement permits fluid to enter the capillary but prevents lymph from leaving the vessel. The microscopic lymph capillaries merge to form lymphatic vessels.
Detailed explanation-4: -Lymph capillaries or lymphatic capillaries are tiny, thin-walled microvessels located in the spaces between cells (except in the central nervous system and non-vascular tissues) which serve to drain and process extracellular fluid. Upon entering the lumen of a lymphatic capillary, the collected fluid is known as lymph.