2 Answers

RoachLord · Answer 1 · 2021-03-21T11:17:51+0000

Answer:

The heart is made of three layers of tissue. Endocardium, the thin inner lining of the heart chambers that also forms the surface of the valves. Myocardium, the thick middle layer of muscle that allows your heart chambers to contract and relax to pump blood to your body.

Step-by-step explanation:

Greg Zimmers · Answer 2 · 2021-03-22T17:43:23+0000

Answer:

Endocardium, the thin inner lining of the heart chambers that also forms the surface of the valves. Myocardium, the thick middle layer of muscle that allows your heart chambers to contract and relax to pump blood to your body.

Step-by-step explanation:

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