A knife that penetrates the lung and enter the heart would first enter:
(1) parietal pleura
(2) visceral pleura
(3) visceral pleura
(4) parietal pleura
(5) fibrous pericardium
(6) serous pericardium
The first membrane, parietal pleura is the outer covering of the lungs and it attaches to the thoracic cage. The next membrane, visceral pleura is the inner covering of the lungs. The fibrous pericardium, like the parietal pleura, is the outer covering of the heart which anchors the heart to the diaphragm and sternum. The serous pericardium, which is made of two layers, is the inner covering and lines the surface of the heart.
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