The Atria and Ventricles are parts of the heart not the blood. The Atria is the upper chambers of the heart and the Ventricles are the lower chambers of the heart.
the atria only pump blood to the ventricles
the atria pump blood only to the ventricles.
No, the other pump in the heart does not move blood from the atria into the ventricles. Instead, the atria receive blood returning to the heart, and they contract to push blood into the ventricles. The ventricles then pump blood out of the heart to the lungs and the rest of the body. This coordinated action ensures efficient blood circulation.
The blood is squeezed into the ventricles.
Veins carry blood to the atria. In contrast, arteries carry blood away from the ventricles.
In the context of the heart, the ventricles are not considered superior; they are actually located inferior to the atria. The atria are positioned above the ventricles, receiving blood from the body and lungs before it is pumped into the ventricles. Therefore, in anatomical terms, the atria are superior to the ventricles.
Assuming you mean the atria and ventricles by "the two heart chambers", the fact that in all species the atria are smaller than the ventricles reflects the fact that the atria receive blood from either the body or the lungs and then pump it into the larger and much stronger ventricles. One-way valves between the atria and ventricles prevent backflow of blood from the ventricles to the atria. The ventricles then pump the blood received from the atria to either the oxygenating organ (i.e. gills or lungs) or the body. The much thicker walls of the ventricles reflect the fact that much greater force is needed to pump the blood throughout the body or to the lungs than is needed to pump the blood from the atria to the ventricles.
The atrioventricular valves prevent the backflow of blood from the ventricles to the atria. They permit the one-directional flow of blood from the atria to the ventricles.
The atrioventricular valves are two heart valves that allow for the transportation of blood from the atria to the ventricles of the heart. Its function is to prevent the return of blood to the atrium.
The atria contract simultaneously to push blood into the ventricles. This coordinated contraction ensures efficient filling of the ventricles with blood before they contract to pump blood out to the rest of the body.
atria are just the receiving chambers, it is the ventricles that actually pump the blood into the pulmonary and systemic circuits