Do the atria receive blood returning to the heart? Does the myocardium receive its blood supply from the coronary arteries?
The answer to both questions is yes.
The heart has two atria that receive blood returning to the heart:
- left atrium: receives blood from the lung circulation
- right atrium: receives blood from the body circulation
The coronary arteries are branches of the aorta and supply the myocardium (heart muscle) with oxygen rich blood.