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Q: How does blood enter the ventricles from the atria?
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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.

Does atria pump blood to the body or lungs?

the atria pump blood only to the ventricles.

What does atria pump blood to the body or the lungs?

the atria only pump blood to the ventricles

When the atria contract the blood is forced into the?

The blood is squeezed into the ventricles.

What is the main function of the right atria left atria?

to force blood to the ventricles

What carry blood to the atria?

Veins carry blood to the atria. In contrast, arteries carry blood away from the ventricles.

Which phase in cardiac cycle is systolic pressure?

Blood flows into the relaxed atria while the ventricles contract. <rephrased> The ventricles contract, carrying blood into the aorta, and blood flows into the relaxed atria.

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.

What areas of the heart does the antrioventricular valve prevent blood flow from?

The atrioventricular valves prevent the backflow of blood from the ventricles to the atria. They permit the one-directional flow of blood from the atria to the ventricles.

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

Does the atrium pump blood to all parts of the body?

No, because the left and right atria are the collecting chambers. They hold theblood until it can enter the ventricles. The ventricles are the pumpingchambers. They cause the blood to move around the body.

What are the functions of the atria and the ventricles of the heart?

Atria is the receiving chamber and it is located at the top while ventricles are the one responsible for pumping blood out of the heart either to oxygenate the blood or to deliver it into our systems and it is located at the bottom part of the heart