This is called systole. When the heart chambers relax, it is called distole. I hope that this helps you out!
The structure that separates one chamber of the heart from another is called Septum
Systole
Are you using this instead of doing homework? Blood comes back into the heart from the lungs via the Pulmonary vein into the Left Atrium.
endocardium
The left lower chamber of the heart (also called left ventricle) is responsible of the nutrition of the entire organism (the systemic circulation), so it has to have the strongest heartbeat so that the blood can flow through all the tissues.
Yes, the heart is made of muscles, however, these muscles do not all contract at one time. They contract in synchrony and when they contract they squeeze the chamber they surround such are the atria or ventricle and blood is pushed out of the chamber.
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.
the lower heart.
diastylic
The structure that separates one chamber of the heart from another is called Septum
Systole