Question

Write about lymphatic capillaries and lymphatic vessels.

Answer 1

Hint: Lymph is the fluid that runs through the lymphatic system, which is made up of lymph vessels and lymph nodes that return fluid from the tissues to the central circulation, similar to the venous system. White blood cells make up the majority of lymphocytes (mainly lymphocytes). Lymph transports digested and absorbed fat from the colon and empties extracellular fluid back into the circulation. The blood receives mature lymphocytes from the lymph. Bacteria and other particles are removed by lymph. It also keeps the fluid equilibrium in check.

Complete answer:
Lymph capillaries, also known as lymphatic capillaries, are microscopic, thin-walled microvessels that drain and process extracellular fluid in the gaps between cells (save in the central nervous system and non-vascular tissues). The collected fluid is known as lymph when it enters the lumen of a lymphatic capillary. Each lymphatic capillary transports lymph to a lymphatic tube, which joins to a lymph node, a small bean-shaped gland that filters and monitors lymphatic fluid for infection. Lymph is eventually restored to the venous system.

The lymphatic vessels (also known as lymph vessels or lymphatics) are thin-walled vessels (tubes) that convey lymph. Lymph vessels are part of the lymphatic system, which works in tandem with the cardiovascular system.
Endothelial cells line lymph vessels, which also have a thin layer of smooth muscle and adventitia, which connects the lymph veins to the surrounding tissue. Lymph veins transport lymph from lymph capillaries, which are primarily responsible for the absorption of interstitial fluid from the tissues.
Lymphatic capillaries have closed ends and are slightly larger in diameter than blood capillaries (unlike the loop structure of blood capillaries). Interstitial fluid can flow into them but not out due to their unique structure.
Endothelial cells that make up the wall of a lymphatic capillary overlap at their ends. When the interstitial fluid pressure exceeds that of the lymph, the cells separate slightly, like a one-way swinging door, and interstitial fluid enters the lymphatic capillary. When the pressure inside the lymphatic capillary is higher, the cells stick together more tightly, preventing lymph from escaping back into the interstitial fluid.
Anchoring filaments, which comprise elastic fibres, are attached to lymphatic capillaries. They stretch from the lymphatic capillary and connect lymphatic endothelial cells to the tissues around them. When excess interstitial fluid builds up and causes tissue swelling, the anchoring filaments are tugged, allowing more fluid to flow into the lymphatic capillary through bigger gaps between cells.
Due to the higher concentration of plasma proteins in the lymph, lymph capillaries have a higher internal pressure than blood capillaries.

Note:-
The lymphatic system, also known as the lymphoid system, is a portion of the circulatory and immunological systems in vertebrates. A wide network of lymph, lymphatic veins, lymph nodes, lymphatic or lymphoid organs, and lymphoid tissues make up the lymphatic system. Your lymphatic system, which is a part of your immune system, serves a variety of purposes. Protecting your body from disease-causing intruders, regulating bodily fluid levels, absorbing digestive tract lipids, and eliminating cellular waste are just a few of them.