BIOL 430 Lecture Notes - Lecture 5: Purkinje Fibers, Interatrial Septum, Atrioventricular Node
Document Summary
Automaticity: an inherent ability of the heart muscle tissue to contract in a rhythmic pattern. Irritability: the ability to respond to a stimulus. Impulse pattern: sinoatrial node to av node to bundle of his to right and left bundle branches to. The contraction and relaxation of the heart must occur in correct sequence. The rate and regularity is determined by electrical impulses, which are controlled by the conduction system, sa node, av node, and bundle of his. Sa node, av node, bundle of his, right and left branches, purkinje fibers. P wave: contraction of the atria. Qrs complex: contraction of the ventricles, atria relaxes as the ventricles contract. T wave: the relaxation of the ventricles. 3 distinct waves or deflections: p wave represents atrial depolarization, qrs represents depolarization of the ventricles, t wave represents the repolarization of the ventricles. A graphic study of the electrical activities of the myocardium: to determine transmission of cardiac impulses through the muscles/conduction tissue.
