DASC20010 Lecture Notes - Lecture 9: Pulmonary Valve, Aortic Valve, Sinoatrial Node
5 Aug 2018
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Left hand side has to pump blood to the body and therefore has thicker muscular walls. Both sides pump equal volume but at different pressures. Structure of the heart: pulmonary veins, left atrium, left av valve, left ventricle, aortic valve, aorta, vena cava, right atrium, right av valve, pulmonary valve. Closure of av valve- some blood left in atria- it contracts first and pumps into the ventricle. Ventricle fills- opens up a valve and allows blood into the artery. Pumps off to the aorta- biggest of the arteries. Pulmonary valve opens and allows blood to the lungs. Cardiac muscle fibres- contract against neighbor fibres- connected to more muscle fibres closely. Intercalated discs: strong holding power- prevents ripping of fibres, desmosomes, tightness of membrane- waterproof, gap junctions, allows ions to move from one end to another- important in calcium when one muscle is contracting- Ca can seep from one muscle cell to another muscle cell.
