Heart
Ventricles
Ventricles
Ventricles
Ventricles
Ventricles
The ventricles are the lower chambers of the heart. The atria are the upper chambers.
Ventricles
The endocardium looks like a heart-shape organ. It has nodes, atriums, and ventricles. It also has an aorta and valves.
....INTRODUCTION: The heart is a powerful muscular organ that can pump 10,000 liters of blood daily.It is a 4 chambered muscular structure.The upper thin walled collecting chambers are called the atria.The lower thick walled pumping chambers are called the ventricles.
The left ventricle. Blood from the body comes into the right atrium goes into the right ventricle and is then pumped to the lung comes back to the left atrium and then left ventricle to the aorta to the body.
No. They are in the organ of the heart
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.