A test that checks for problems with the electrical activity of your heart.

A dividing wall in an animal structure.

The insoluble protein product of blood coagulation.

The vessels that transport the blood from the body to the heart.

The artery that transports blood from the right ventricle of the heart to the lungs.

The membrane sac enclosing the heart.

Blood that has flowed through the body and is returning to the lungs.

The dilatation of the heart during which the chambers fill with blood.

Red blood cells.

The two lower chambers on each side of the heart that receive blood from the atria and in turn force it into the arteries.

A small mass of fibers between the atria that conducts the impulse received from the sinoatrial node.

White blood cell.

The liquid part of blood or lymph.

The pressure of the blood against the inner walls of the blood vessels.

The contraction of the heart that forces the blood out.

Minute bodies in blood that aid in coagulation.

Blood that has been exposed to oxygen in the lung.

The two upper chambers on each side of the heart

The area of the heart that creates the electrical impulses; stimulating the heart to beat.