It doesn't matter that some immunizations are combined into one injection when a code for the injection is assigned, because two codes are required regardless

Before draining into the right atrium, where do the large veins of the coronary circulation gather together?

a. Coronary sinus b. Left posterior coronary vein c. Right coronary sulcus d. Thebesian veins

Mixing of venous blood with arterial blood (a right-to-left shunt) occurs normally because of which of the following? 1. Congenital cardiac defects 2. Bronchial venous drainage 3. Thebesian venous drainage in the heart

a. 1, 2, and 3 b. 2 and 3 only c. 1 only d. 2 only