Final answer:
The relaxation and dilation of the heart chambers that allows them to fill with blood is called diastole. During diastole, the atria pump blood into the ventricles while the ventricles relax and fill with blood. The coronary vein is responsible for taking blood away from the heart tissue back to the chambers in the heart during diastole.
Step-by-step explanation:
The relaxation and dilation of the heart chambers that allows them to fill with blood is called diastole.
During diastole, the atria contract and pump blood into the ventricles, while the ventricles relax and fill with blood from the atria. This phase of the cardiac cycle is essential for efficient pumping of blood to the body.
The coronary vein is responsible for taking blood away from the heart tissue back to the chambers in the heart during diastole.