Assertion: right atrium | /r/HasProperty | right upper chamber
Facets:
Source sentences:
text: A normal heartbeat begins with an electrical impulse from the sinus node, a small area in the heart's right atrium (right upper chamber).
text: Right atrium is the right upper chamber that receives deoxygenated blood from the body while left atrium is the left upper chamber that receives oxygenated blood from the lung.