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Select the best answer or answers from the choices given: Entry of lymph into the lymphatic capillaries is promoted by which of the following? (a) one-way minivalves formed by overlapping endothelial cells, (b) the respiratory pump, (c) the skeletal muscle pump, (d) greater fluid pressure in the interstitial space.
Tissues and organs that work towards the same function together form an organ system. The digestive system, immune system, circulatory system, lymphatic system, and nervous system are some examples of organ systems. The lymphatic system includes bone marrow, thymus, spleen, lymph nodes, lymphatic vessels, and tonsil.
Lymphatic vessels are the network of vessels that collects lymph (fluid) and connects the lymph nodes present throughout the body. The lymph is a fluid filtrate obtained from the filtration of blood. It comprises white blood cells (WBC) mainly T-cells, B-cells, and antigen-presenting cells (APCs).
Endothelial cells are the cells that line the internal organs to protect them from exposure to the external environment. Endothelial cells lined the blood vessel.
Endothelial cells regulate the contraction and relaxation of blood vessels. Overlapping of adjacent endothelial cells creates one-way flaps that are opened from the inside (in the blood vessels). This allows the entry of lymph into lymphatic vessels and also stops the flow of the fluid in the reverse direction.
Hence, option A - 'one-way mini valves formed by overlapping endothelial cells' is correct.
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