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The upper chambers are the (left) atrium and the (right) atrium. The lower chambers are called the (left) ventricle and the (right) ventricle.
The heart is divided into four chambers. The two bottom heart chambers are called the ventricles. The upper chambers are the atrials.
The lower chambers of the heart are the ventricles. In contrast, the upper chambers are the atria.
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.
The upper chambers of the heart are called auricles/atria and the lower chambers of the heart are called ventricles. The valve between the left atrium and the left ventricle is called the Bicuspid valve/Mitral valve. The valve between the right atrium and the right ventricle is called the Tricuspid valve.
Atria. (Singular: atrium)
If I am not wrong the lower two chambers of the heart are called as ventricles i.e. left ventricle and right ventricle while the upper two chambers of the heart are called as atria( plural of atrium) i.e. left atrium and right atrium.
The heart has upper and lower chambers.
The ventricles are the lower chambers of the heart. The atria are the upper chambers.
atroventricular (AV) node
The lower chambers of the heart have a different function than the upper chambers. The lower chambers pump the blood out of the heart into the body and lungs.
The four chambers of the heart are the right and left atria, and the right and left ventricles. The atria are the upper chambers, and the ventricles the lower.