right atrium

US /ˌraɪt ˈeɪ.tri.əm/
UK /ˌraɪt ˈeɪ.tri.əm/
"right atrium" picture
1.

the right upper chamber of the heart that receives deoxygenated blood from the body through the vena cavae and pumps it into the right ventricle

:
Deoxygenated blood enters the heart through the right atrium.
The tricuspid valve separates the right atrium from the right ventricle.