BSC 2011C Lecture Notes - Lecture 21: Atrioventricular Node, Pulmonary Vein, Sinoatrial Node

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29 Mar 2017
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All animals need mechanisms to exchange materials such as nutrients and gases at the cellular level. Complex multicellular animals need specialized systems to reach all the cell"s body for this exchange. Circulatory fluid; interconnecting tubes; muscular pump: heart: circulatory systems link exchange surfaces with cells throughout the body. Arteries: carry blood away for the heart and towards organs. Capillary beds: networks of capillaries hat infiltrate tissues. Heart> pulmonary arteries> pulmonary veins> heart> arteries> arterioles> capillaries> Venules> veins>heart: coordinated cycles of heart contraction drive double circulation in mammals. The cardiac cycle is one complete sequence of pumping (heart contracts, systole) and filling of blood (heart relaxes, diastole) Atrioventricular (av): flap of connective tissue preventing back flow into atria when ventricles. Semilunar valve: prevents backflow of blood leaving heart. Heart murmur: defect in valves, may cause backflow of blood contract e. g. body position, heat, activity level. Sinoatrial node (sa): pacemaker in wall of right atrium that synchronizes cardiac cells" contraction.

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