As i have just learned the heart receives oxygen rich after creating a loop with the lungs .The blood is never entering the frog though because it is always in the frog.
Aorta
The large blood vessel is called the aorta.
Aorta.
pancreas
the heart
aorta
Artery
heart catherization
Aorta (the largest artery, carries blood out of the heart)
An artery.
Descending aorta
Aorta