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The heart wall is composed of layers numbering:

A2
B4
C5
D3
Answer & Solution
Correct answer: D. 3
1. From the outside in they are named in order. 2. Epicardium, myocardium and endocardium. 3. So there are 3 layers. _Source: OpenStax Anatomy and Physiology 2e, Chapter 19, The Cardiovascular System: The Heart._
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