Question

A double walled sac which serves to protect the heart is called _________​

Answer 1

Answer:

Pericardium

Explanation:

Pericardium layers

The pericardium has two layers: Fibrous pericardium is the outer layer. It's made from thick connective tissue and is attached to your diaphragm. It holds your heart in place in the chest cavity and protects from infections.

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Answer 2

Answer:

pericardium

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