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there are 4 chambers; the top 2 of the heart (right and left) are called the atria and the bottom 2; the ventricles.
The human heart has four chambers connected by valves. We have 2 smaller chambers on the upper half of our heart and two larger chambers on the bottom of our heart. The smaller chambers are called atria; the larger chambers are called ventricles. So we refer to these chambers as right and left atrium, and right and left ventricle.
Ventricles
Their are 2 heart chambers.
Right ventricle and left ventricle
The heart is divided by a partition or septum into two halves. The halves are in turn divided into chambers. The upper two chambers of the heart are called atria and the lower two chambers are called ventricles. The atria receive blood returning to the heart from the body and the ventricles pump blood from the heart to the body. Valves allow blood to flow in one direction between the chambers of the heart.
An atrium is in the heart, it is the top two chamber of the heart. the right atrium deals with deoxygenated blood from the body, whereas the left atrium deals with oxygenated blood from the lungs.
4 chambers, the Left and right Atrium which are on the top and the left and right ventricals which are on the bottom
Clams have the most complex heart of the mollusks, with 3 chambers.
Sharks have 2 chambers
A snails heart has 2 chambers.
the 2 lower chambers of the heart