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Transcript
The Heart Continued... • Human heartbeats originate from the SA node near the right atrium. • Cardiac muscle cells contract, sending a signal to other muscle cells in the heart to contract. • The signal spreads to trigger the AV node • Signals carried from the AV node, then spread and cause the ventricles to contract simultaneously. Electrical Conduction Electrical Conduction Measurement of Heart Contractions • An electrocardiogram (ECG) measures changes in electrical potential across the heart – detects the contraction pulses that pass over the surface of the heart. – ECGs are useful in diagnosing heart abnormalities. Electrical conduction across the heart • The P wave represents the contraction impulse of the atria, the T wave the ventricular contraction. Abnormalities
