Which of the following contains/contain oxygenated blood?
A) pulmonary trunk
B) pulmonary arteries
C) pulmonary veins
D) brachiocephalic veins
E) SVC
Question 2
The function of valves in the heart is to
A) permit blood to flow in either direction.
B) permit alternating flow of blood forward and backward.
C) prevent backflow.
D) act as a pacemaker.