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The endocardium is a) the lining of the atria. b) The muscular wall that makes up the greater part of the heart. c) Part of the endocrine system. D) part of the renal system.

User Phoibos
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Answer:

B

Step-by-step explanation:

a c and d do not cover the essential parts of the heart C and D are not even parts of the cardiac system

User Oliver Leung
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