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Question

A two-layered sac surrounding the heart is called
  1. Pericardium
  2. Perichondrium
  3. Periosteum
  4. Pleura


Solution

The correct option is A Pericardium
The heart remains enclosed in a double-walled sac called pericardium, consisting of an outer non-distensible fibrous layer and an inner serous layer. In between the two layers, there is a very narrow space, called the pericardial cavity, which is filled with pericardial fluid.

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