This is called systole. When the heart chambers relax, it is called distole. I hope that this helps you out!
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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 fox has a 4 chambered heart.