Compare the Circulatory system and the Lymphatic system
Closely connected with the blood and circulatory system, the lymphatic system is an extensive drainage system that returns water and proteins from various interweaves back to the blood stream.
When blood reaches the arterial check of the capillary beds in the body tissues, fluid from the plasma is hale out of the capillaries by the blood pressure in to a space between the capillaries and the tissue cells. This fluid, called tissue fluid, is plasma that has permeated with the blood capillary walls and has surrounded the cells to bring them nutrient and to mangle their muck up substances. Tissue fluid is an aqueous solution containing glucose, aminic acids, fatty acids, inorganic ions, oxygen and hormones, which diffuse into the tissue cells to submit out the metabolic reactions.
Most of the tissue fluid, now containing fewer nutrients and slight oxygen but more carbon dioxide and metabolic waste products, passes back into the venous end of the capillary network and consequently back to the heart. The small amount of Tissue fluid that ashes is picked up by tiny vessels called the lymph capillaries. The cells forming the walls of the lymph capillaries are loosely fitted to winher, therefore making the wall very porous.
Even the large serum proteins that filtered through the capillary wall pass easily from the tissue fluid into the interior of the lymph capillary. The lymph capillaries drain into still larger vessels that reach up the lymphatic system. The flow through the lymph vessels is quite slow. The lymphatics agree the veins in their structure having;
1)An outer coat of fibrous tissue
2)A pump coat of muscular elastic tissue
3)An inner lining do up a single layer of epithelial cells
Also alike(p) the blood in the veins, contraction of skeletal muscles compresses...
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