frogelectrocardiography.ppt

frogelectrocardiography.ppt - Cardiac Muscle Striated...

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Unformatted text preview: Cardiac Muscle Striated muscle of heart spontaneously depolarizes SA node - AV node - bundle of His purkinje fibers Intercalated disks -low resistance structures between adjacent cardiac cells Nervous control Flow of current EKG or ECG Refractory period Absolute refractory period is time during which the excitable membrane cannot generate action potential in response to any stimulus In cardiac muscle absolute refractory period occurs throughout systole. Extrasystole, compensatory pause All-or-none contraction in heart All cells in myocardium are electrically joined Heart contains 2 myocardia, atria and ventricles Frank-Starling law of heart Strength of contraction varies directly with end-diastolic volume No graded contraction because all cells in myocardium contract at once Ability of myocardia to contract increased by epinephrine and stretching Preparing frog Frog heart lab report due next week Quiz on heart lab next week ...
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This note was uploaded on 04/09/2008 for the course BIO 3700 taught by Professor Mcclellan during the Spring '08 term at Missouri (Mizzou).

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frogelectrocardiography.ppt - Cardiac Muscle Striated...

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