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Circulatory System Azami PHD Heart 3 layers: epicardium, myocardium and endocardium External Heart: Anterior View Figure 17.4b External Heart: Posterior View Figure 17.4d Pathway of Blood through the Heart and Lungs Figure 17.5 Relative thickness of muscular walls? Figure 17.7a “EKG” (or ECG, electrocardiogram) • Electrical depolarization is recorded on the body surface P wave=atrial depolarization QRS=ventricular depolarization T wave=ventricular repolarization Arteries Greek karoo, to put to sleep radial & ulnar a. Venous system Superficial veins of hand Median cubital Head and Neck Latin jugulum = neck