The heart is located in the (a)   of the thoracic cavity.

The (a)   prevents the blood that is flowing through the heart from being absorbed into the muscle of the heart.

The (a)   is also known as the visceral pericardium.

The apex of the heart rests on the (a)   .

The pericardial sac is correctly known as the (a)   .

The pericardial fluid allows the heart to beat in a (a)   environment.

The (a)   anchors the heart to the diaphragm and the sternum.

The place where the branching ends of the cardiac muscle fibers interlock are the (a)   .

The heart is about the size of a persons (a)   .

The layer that prevents pericardial fluid from being absorbed into the muscle tissue of the heart is the (a)   .

The layer of the heart that does the work of the heart is the (a)   .

Cardiac muscle fibers are attached by (a)   junctions.

The "skeleton of the heart" that reinforces the myocardium is made of (a)   connective tissue.

The loose fitting superficial layer of the pericardial sac is the (a)   pericardium.

The chambers of the heart with the thinnest myocardium and lowest blood pressure are the (a)   .

The chambers of the heart that are responsible for the work of the heart are the (a)   .

The layer of muscle tissue that separates the left and right side of the heart is known as the (a)   .

The right ventricle pumps blood to the (a)   .

The (a)   are known as the receiving chambers of the heart.