| A | B |
|---|
| superior vena cava | Top vein that takes deoxygenated blood to the right atrium of the heart. |
| pulmonary valve | Allows blood to leave the right ventricle and prevents backflow into the ventricular chamber. |
| aortic valve | Allows blood to leave the heart and when closed prevents blood from backing up into the ventricle. |
| pulmonary arteries | Lead from the heart to the lungs. |
| pulmonary veins | Sends blood from the lungs to the heart. |
| atria | Upper chambers of the heart that receive returning blood. |
| tricuspid valve | Permits blood to move from the right atrium into the right ventricle and prevents backflow. |
| ventricles | Lower portion of the heart that receive blood from the atria and then contract to force blood out of the heart and into the arteries. |
| inferior vena cava | Bottom vein that takes deoxygentaed blood to the right atrium of the heart. |
| septum | Solid wall-like structure that separates the atria from the ventricles. |
| papillary muscles | Help the ventricles to contract to push blood out of the heart and into the arteries. |
| bicuspid (mitral) valve | Allows blood to pass from the left atrium into the left ventricle and prevents backflow. |
| pulmonary trunk | The only exit for blood from the heart that leads to the pulmonary arteries. |
| aorta | Largest artery. |
