BIPN 100 Lecture Notes - Lecture 16: Elastic Fiber, Purkinje Fibers, Pericardium
28 Mar 2018
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Channels to opened by dhp open voltage gated ryr. No tetanus: parasympathetic activity decreases heart rate, sympathetic activity increases heart rate. Sympathetic neurons (ne) --> (cid:1005)-adrenergic receptors of autorhythmic cells -- > g s pathwa(cid:455) --> na+ & ca(cid:1006)+ influ(cid:454) --> rate of depolarization--> heart rate. Parasympathetic neurons (ach) --> muscarinic receptors of autorhythmic cells. Ach on muscarinic receptors: sympathetic: depolarization, increase hr. Norepinephrine on b receptors: cardiovascular system, closed loop circulatory system, pump: heart, tubes: vasculature, liquid: blood, arteries: take blood away from heart. More elastic tissue to increase compliance: veins: bring blood back to heart. Valves to prevent back flow due to low pressure: mitral: tricuspid & bicuspid (atrioventricular valves) keep blood in ventricle, semilunar: aortic & pulmonary semilunar valves. The arteries and veins all attach to the base of the heart: the conducting system of the heart, sa node depolarizes -> rapidly reaches av node by intermodal pathways -
