The heart is surrounded by an inner fibrous and outer serous pericardium.

The heart is divided into two atria and two ventricles.

The right side of the heart receives blood from the pulmonary veins.

The right side of the heart receives blood from the superior and inferior vena cava.

The aorta arises from the left ventricle.

There is one pulmonary vein on each side.

The muscle layer of the left ventricular wall is thinner than that of the left atrium.

The left atrium receives venous blood from the pulmonary circulation.

The septum between the left and right atria is the thickest wall in the heart.

The two cardiac semilunar valves are the aortic and pulmonary.

Highly oxygenized blood flows through the pulmonary artery.

The mitral valve is between the left and right atria.

The trabeculae carneae are the muscular ridges and bridges on the interior of the ventricles.

The heart chambers are lined with pericardium.

The right atrium has a completely smooth interior.

Both atria have anterior ear-shaped appendages called the auricles.

The bridge from the ventricular septum to the base of the anterior papillary muscle carries part of the right bundle/branch of the conducting/pacemaking system.

The heart chamber at the posterior base of the heart is the right atrium.

A prominent interventricular sulcus marks the boundary between the two ventricles.