If you mean the heart, the atria are separated from each other by the atrial septum. If you mean the atria from the ventricles, the right is separated by an AV valve called the tricuspid. The left by a an AV valve called the bicuspid or mitral valve.
The interatrial septum separates the upper chambers. This wall prevents the mixing of oxygenated and deoxygenated blood.
The interatrial septum separates the left atrium from the right atrium (the atria are the upper chambers of the heart).
The interatrial septum separates the right and left atria.(upper chambers)
They are the two lower chambers if the heart, responsible for pumping blood out to the body.
The AV valves separate the upper and lower chambers of the heart. The bicuspid valve is on the left, and the tricuspid on the right.
Upper chambers of heart are the left and right atrium Lower are the left and right ventrical atrioventricular valves separate the two. Bicuspid (mitrial) valve separates the left atrium/ventrical and the tricuspid separates the right atrium/ventrical.
The upper chambers of the heart are called atria, and the wall that separates them is called the atrial septum. Thus a defect in that wall is called an atrial septal defect. They are not uncommon, and can run in families and be associated with genetic abnormalities such as Down syndrome.
The walls of the upper chambers are thinner than those of the lower chambers. The upper chambers don't need to generate as much pumping force as the ventricles.
There are 4 heart chambers. The two upper chambers are called atria while the two lower chambers are called ventricles. The valve separating the atria from the ventricles is called the atrioventricular valve. Then you would have your right and left atrioventricular valves.
Septum
the upper chambers of the heart are called the right and left atrium and they are the receiving chambers of the heart
The upper chambers in the heart are called atria (singular: atrium).
The upper chambers of the heart are called the atria (singular: atrium).