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Thoracic viscera Plural Cavities Figure 1.9 Development of serousal cavities Development of Pleural cavities Hemo-thorax Pneumo-thorax Lung: collapse Mediastinum Figure 1.9 Heart Covering • Pericardial physiology – Protects and anchors heart – Prevents overfilling Figure 17.2 External Heart: Anterior View Figure 17.4b External Heart: Posterior View Figure 17.4d External Heart: Anterior View Figure 17.4b External Heart: Anterior View Figure 17.4b Heart Valves Figure 17.9 Heart Valves Figure 17.10 External Heart: Posterior View Figure 17.4d Figure 17.4b Pathway of Blood through the Heart and Lungs Figure 17.5 Relative thickness of muscular walls “EKG” (or ECG, electrocardiogram) • Electrical depolarization is recorded on the body surface P wave=atrial depolarization QRS=ventricular depolarization T wave=ventricular repolarization Cardiac muscle (microscopic)