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
The human heart has four chambers.The upper two chambers are called Atria and the lower two are called Ventricles