The double-layer membrane surrounding the heart is called?

The double-layer membrane surrounding the heart is called?

• A. Pericardium
• B. Myocardium
• C. Endocardium
• D. Pleura

Answer: (A)

The double-layer membrane around the heart is the pericardium. It forms an outer fibrous layer plus an inner serous layer, which is divided into a parietal part that lines the fibrous sac and a visceral part that adheres to the heart (the epicardium). The small space between these layers, the pericardial cavity, contains fluid that reduces friction as the heart beats and helps suspend and protect the heart in the chest. The other terms refer to different structures: the myocardium is the muscular wall of the heart, the endocardium lines the heart’s inner chambers, and the pleura surrounds the lungs.

The double-layer membrane around the heart is the pericardium. It forms an outer fibrous layer plus an inner serous layer, which is divided into a parietal part that lines the fibrous sac and a visceral part that adheres to the heart (the epicardium). The small space between these layers, the pericardial cavity, contains fluid that reduces friction as the heart beats and helps suspend and protect the heart in the chest. The other terms refer to different structures: the myocardium is the muscular wall of the heart, the endocardium lines the heart’s inner chambers, and the pleura surrounds the lungs.