BIOA02H3 Lecture 5: BGYA02 - Lec5 (text+lec combined notes)
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BIOA02H3 Full Course Notes
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A circulatory system consists of a muscular pump (the heart), a fluid (the blood), and a series of conduits (the blood vessels) through which the fluid can be pumped around the body. Heart, blood and vessels are also known collectively as a cardiovascular system. The larger forms are more inactive, slow or even sedentary: larger and more active animals must support metabolism of cells by delivering nutrients to them and taking wastes away from them with circulatory systems. In many animals the extracellular fluid is continuous with fluid in the circulatory system. The vessels of these animals empty their fluid directly into the tissues. At other locations the fluid flows back into the circulatory system to be pumped back out again. Muscle pump assists distribution of fluid in these systems. Contractions of heart propel extracellular fluid through vessels to different regions of the body. Fluid leaves vessels to trickle through tissues and eventually return to the heart.