Question

multiple choice question
what is the double - layered sac that surrounds the heart called?

• endocardium
• pericardium
• pericardial cavity
• epicardium

Explanation:

To solve this, we analyze each option:

• Endocardium: Inner lining of the heart, not a sac.
• Pericardium: Double - layered sac surrounding the heart.
• Pericardial cavity: Space between pericardial layers, not the sac.
• Epicardium: Outer layer of the heart wall, not a sac.

Answer:

B. Pericardium