BIOL273 Lecture Notes - Lecture 4: Surface Layer, Heart Rate, Atrioventricular Node

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Lack of oxygen causes irreparable damage: 5 to 10 seconds of interrupted blood flow means loss of consciousness, 5 to 10 mins of interrupted blood flow means permanent brain damage. Introduction: divided (functionally) into two separate pump that work in series. Increase the pressure: pumps blood into the lungs, blood picks up oxygen for transport to the rest of the body, small radius, high surface area leads to increase resistance and therefore. Lack of blood flow due to coronary artery blockage: build up of plaque due to atherosclerosis, blood clot lodged in coronary artery (thrombosis or occlusion) Internal anatomy of heart: parts of the heart. Left ventricle (receive blood from left atrium and sends to body) Initiation of cardiac contraction: specialized cells, heart is different from other muscles, doesn"t not require input from nervous system for contraction, heart contains specific cells called pacemaker (auto rhythmic) cells.

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