NATS 1675 Lecture Notes - Lecture 18: Heart Valve, Cardiac Muscle Cell, Atrioventricular Node
28 Mar 2017
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5. 1): heart = a pump (actually 2 pumps, 4 chambers): Lower chambers = ventricles: blood vessels, arteries } carry blood away from the heart, capillaries} connect arterioles to venules; walls are one cell thick; all exchanges occurs here, veins}return blood to the heart. The circulatory system interconnects with 10 other organ systems. S-a node --> a-v node --> bundle of his --> pukinje fibres (the bolded terms are the pacemakers) Cs3 normal pulse fluctuations, either up or down from 72, are in response of either the nervous or hormonal systems. Arrhythmia is any disturbance in the rate of the heart beat. Arrhythmia frequently follows a heart attacks or heart failure, but also occurs when there is a defect in the conduction system of the heart. Fibrillation is a life threatening condition in which the heart muscle is contracting very rapidly, but in an uncoordinated and ineffective fashion.
