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When atria relax ventricles do what?
When relaxed, the atria expand, and then the ventricles contract.
Do atria contract before the ventricles?
Yes, atria contracts before the ventricles.
What difference atria and ventricles fetal pig?
the difference between the ventricles and the atria is that the ventricles are thicker
Function of atria?
ventricles
What part of the blood is atria and 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.
What is the main function of the right atria left atria?
to force blood to the ventricles
What makes the valves between atriums open and close?
There are no valves between the atria. The valves between the atria and ventricles close when the ventricles contract.
Why have the ventricles got thicker walls then the atria?
atria are just the receiving chambers, it is the ventricles that actually pump the blood into the pulmonary and systemic circuits
What part of your body has two atria and two ventricles?
I believe this would be your heart because that is the only time ventricles and atria are brought up.
How would you say the structural difference reflects the relative functions of the two heart chambers?
Assuming you mean the atria and ventricles by "the two heart chambers", the fact that in all species the atria are smaller than the ventricles reflects the fact that the atria receive blood from either the body or the lungs and then pump it into the larger and much stronger ventricles. One-way valves between the atria and ventricles prevent backflow of blood from the ventricles to the atria. The ventricles then pump the blood received from the atria to either the oxygenating organ (i.e. gills or lungs) or the body. The much thicker walls of the ventricles reflect the fact that much greater force is needed to pump the blood throughout the body or to the lungs than is needed to pump the blood from the atria to the ventricles.
Are atria and ventricles organs?
No. They are in the organ of the heart
What are the two parts of the hearts?
The atria and the ventricles
