The heart has four chambers: the right atrium, right ventricle, left atrium, and left ventricle. The third chamber, when counted in terms of the heart's anatomy, is the left atrium. This chamber receives oxygenated blood from the lungs and pumps it into the left ventricle, which then distributes the blood to the rest of the body.
Its called the ventricle
Diastole.
ventricle
They are called ventricles.
The left atrium
The left atrium
The lower left chamber of the heart is called the left ventricle. It is thick and muscular hence manifests a stronger heart beat.
This is called systole. When the heart chambers relax, it is called distole. I hope that this helps you out!
the lower heart.
The structure that separates one chamber of the heart from another is called Septum
Systole
There is no such thing as a fiber chamber of the heart.