Essay on Circulatory Systems : The Blood System

1967 Words Feb 13th, 2015 8 Pages
The human body has two major circulatory systems: the blood and lymphatic systems. Although the blood vascular system and the lymphatic system operate in parallel and share some anatomical features, the two vascular systems have had very different fates in science and medicine, as they display distinct structural and functional features. While the blood system has been extensively studied and examined, the lymphatic system has been neglected and considered as less important compared with the blood system. The word lymph comes from the Latin word lymphaticus, meaning, "connected to water," as lymph is clear, nevertheless our knowledge about the lymphatic system is far from clear. Yet, in past decades, a series of landmark discoveries has unraveled much of the mystery of the lymphatic system and yielded a burst of new knowledge in the field of vascular biology and medicine.

The circulatory vascular system is a closed circular network, in which blood leaves from the heart to deliver oxygen, glucose, amino acids and other nutrient to the tissue through the body, and returns to the same organ (heart). As blood passes through the tissues of the body, it enters thin-walled capillaries to facilitate diffusion of nutrients and oxygen. On the arterial side, the capillaries are leaky and that allows the blood plasma to penetrate and accumulate into the spaces between the cells of the tissues, forming what is called the extracellular fluid or the interstitial fluid. However, the…

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