The chambers in the heart with thin walls that are highly distensible are the .

The internal connective tissue framework of the heart is called the .

The serous membrane lining the pericardial cavity is called the .

The right side of the heart contains blood with an abundance of the gas .

Oxygenated blood is returned to the left atrium via the .

The only arteries in the body that carry deoxygenated blood are the arteries.

The muscular wall of the heart which forms both atria and ventricles is the .

The process following depolarization of heart cells is termed .

The action of cardiac muscle tissue contracting on its own in the absence of neural stimulation is called .

The recording and evaluating of electrical events that occur in the heart constitutes a(n) .