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The innermost layer lining the heart chambers is the:

AEctocardium
BEntocardium
CEpicardium
DEndocardium
Answer & Solution
Correct answer: D. Endocardium
1. It sits against the blood inside the chambers. 2. It joins the myocardium through connective tissue. 3. That layer is the endocardium. _Source: OpenStax Anatomy and Physiology 2e, Chapter 19, The Cardiovascular System: The Heart._
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