This view of the heart is seen as if the atria and the major vessels have been removed. You should be able to see all of the major valves of the heart. The most anterior valve is the pulmonary semilunar valve that occurs between the right ventricle and the pulmonary trunk. Label and color this valve blue. Posterior to this is the aortic semilunar valve. It occurs between the left ventricle and the aorta. Label this valve and color it in red. Both of these valves prevent blood from returning to the ventricles once they have finished contracting. On the right side of the illustration (and on the right side of the heart) is the right atrioventricular (or tricuspid) valve, so named because it has three flaps or cusps. This valve occurs hetween the right atrium and the right ventricle. It prevents the blood from returning to the right atrium during ventricular contraction. Label this valve and color it blue. On the left side of the heart is the left atrioventricular (bicuspid) valve. It prevents blood from moving back to the left atrium when the left ventricle contracts.
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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.