They are pairs of chambers inside the heart, which have valves.
When relaxed, the atria expand, and then the ventricles contract.
Yes, atria contracts before the ventricles.
the difference between the ventricles and the atria is that the ventricles are thicker
Atria don't do nearly the same amount of work of contraction as do the ventricles. They are therefore relatively thin walled. Most of the blood that flows from the atria to the ventricles flows passively, and so the atria function mostly as a reservoir for blood volume.
Atria don't do nearly the same amount of work of contraction as do the ventricles. They are therefore relatively thin walled. Most of the blood that flows from the atria to the ventricles flows passively, and so the atria function mostly as a reservoir for blood volume.
The atria contract simultaneously to push blood into the ventricles. This coordinated contraction ensures efficient filling of the ventricles with blood before they contract to pump blood out to the rest of the body.
ventricles
The Atria and Ventricles are parts of the heart not the blood. The Atria is the upper chambers of the heart and the Ventricles are the lower chambers of the heart.
please help me with this question
There are no valves between the atria. The valves between the atria and ventricles close when the ventricles contract.
atria are just the receiving chambers, it is the ventricles that actually pump the blood into the pulmonary and systemic circuits
I believe this would be your heart because that is the only time ventricles and atria are brought up.