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Heart excitation - PowerPoint PPT Presentation

Figure 18.14a

Figure 18.14a. Heart Excitation Related to ECG. SA node generates impulse; atrial excitation begins. Impulse delayed at AV node. Impulse passes to heart apex; ventricular excitation begins. Ventricular excitation complete. SA node. AV node. Bundle branches. Purkinje fibers.

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1.17k views • 23 slides

Microscopic Anatomy of Heart Muscle

Microscopic Anatomy of Heart Muscle. Cardiac Muscle Contraction. Heart muscle: Is stimulated by nerves and is self-excitable (automaticity) Contracts as a unit Has a long (250 ms) absolute refractory period Cardiac muscle contraction is similar to skeletal muscle contraction.

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999 views • 7 slides

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Heart excitation - PowerPoint PPT Presentation

Figure 18.14a

Microscopic Anatomy of Heart Muscle