The ligamentum arteriosus is the remains of the:
a. umbilical artery
b. umbilical vein
c. pulmonary trunk
d. ductus arteriosus
Answer: d. ductus arteriosus
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What is the superficial fibrous covering of the heart that is composed partly of dense irregular connective tissue?
A. Myocardium B. Endocardium C. Epicardium D. Parietal pericardium E. Visceral pericardium
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