The myocardium is the A. delicate lining of the atria. B. smooth lining of ventricles. C. inner lining of atria and ventricles. D. muscular wall making up the bulk of the heart.

Respuesta :

The answer should be D. Here are a few references I used.

Website with information: https://study.com/academy/lesson/myocardium-definition-function.html#/transcriptHeader

You can always ask Google, your best friend :)
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