The heart
a. is a four-chambered muscular pump
b. is posterior to the trachea
c. is lined with an epithelial layer called epicardium
d. lies mostly to the right of the midline of the sternum
e. has a superior apex and an inferior base

Blood in the superior vena cava will enter the _____.
a. Aorta
b. right atrium
c. pulmonary trunk
d. pulmonary arteries
e. pulmonary veins

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