a. Atria. Two chambers are called the atria (singular: atrium). Down the middle, an interatrial septum separates the two atria.
(1) The muscular walls of the atria tend to be relatively thin.
(2) Attached to each atrium is an earlike appendage called an auricle. The auricles of the atria tend to have somewhat thicker walls.
b. Ventricles. The other two chambers are the right and left ventricles. Between the ventricles is the interventricular septum.
(1) The left ventricle tends to be cylindrical in shape. It has a relatively thick wall.
(2) The right ventricle has a somewhat semilunar (half-moon) cross section, since it is wrapped around one side of the left ventricle.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.