Because there is less blood regulating through the lungs and atria. The ventricles have to pump blood through the whole rest of your body.
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.
When relaxed, the atria expand, and then the ventricles contract.
Yes, atria contracts before the ventricles.
because it is oxygenated blood
the difference between the ventricles and the atria is that the ventricles are thicker
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.
uricles are part of the atria and serve to increase the volume of the atria. The atria that they are a part of serve to direct blood into the ventricles and are not very muscular. The ventricles are far more muscular than the atria and serve to pump blood to either the lungs or the rest of the body ( the right and left ventricles respectively).
The Ventricles are bigger and rougher than the AtriumsThe Ventricles are bigger and rougher than the Atriums.sizeshapewall thickness
The atria form the smaller part of the heart, while the ventricles form the larger part of the heart.
upper left and right atria and lower left and right ventricles. Atria are divided by interatrial septum&ventricles by interventricular septum.Both Atria&Ventricles are separated by tricuspid&bicuspid valves
-the atriums are smaller then the ventricles. -the atriums have thinner muscle tissue. -the atriums only have to pump blod to the ventricles. -the ventricles are larger in size. -the ventricles have larger muscle tissue. -the ventricles have to pump blood to either the lungs or around to the rest of the body. hope this helpedddd ;D xox <3 Bellaaaa
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.