note on external heart and internal heart
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Explanation:
External features of Heart.
Pericardium Pericardium is a fibroserous sac that encloses the heart and roots of the great vessels. Relations of Pericardium: Anterior: Body of Sternum 2nd to 6th costal cartilages Posterior: 5th to 8th thoracic vertebrae.
Layers of the Pericardium 1.
The human heart is a four-chambered muscular organ, shaped and sized roughly like a man's closed fist with two-thirds of the mass to the left of midline. The heart is enclosed in a pericardial sac that is lined with the parietal layers of a serous membrane.
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Answer:
THE HUMAN HEART IS A CHAMBER
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