Which structure is a double-layered membrane that secretes a slippery, watery fluid around the heart?
A) pericardium
B) mediastinum
C) endocardium
D) myocardium
A
Explanation: A) Correct! The pericardium is a double-layered membrane around the heart.
B) The mediastinum is a central area in the thoracic cavity that holds the heart.
C) The endocardium is the inner lining of the heart.
D) The myocardium is the muscular layer of the heart.
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