Which chamber of the heart receives oxygenated blood coming from the heart?

(a)  

Which chamber of the heart receives the oxygen poor blood from different parts of the body?

(a)  

What valve prevents the back flow of blood from the left ventricles to the left atrium?

(a)  

Which valve allows the passage of blood from the left ventricle to the aorta?

(a)  

What valve allows the flow of blood from the right ventricle to the pulmonary artery?

(a)  

Why is the wall of the left ventricle thicker than the right?

What layer of the heart composes the muscle that actually pumps?

(a)  

What tissue layer of the heart is in direct contact with the blood?

(a)