| A | B |
|---|
| Aorta | The largest artery |
| Aortic Valve | Between the left ventricle and aorta |
| Arteries | Large blood vessels that carry oxygen-rich blood away from the heart to all regions of the body. Arterial blood is bright red in color. |
| Arterioles | Smaller branches of arteries. They are thinner than arteries and carry the blood to the capillaries. |
| Atria | Chambers of the heart receiving blood from the veins |
| Capillaries | Microscopic vessels only one epithelial cell in thickness (similar in thickness to a strand of hair). The slower blood flow though these allowing time for the exchange of oxygen, nutrients and waste materials between the tissue fluids and the surrounding cells. |
| Cardiovascular System | Made up of the heart, blood vessels and the blood |
| Inferior Vena Cava | Drains from the lowest portion of the body into the right atrium of the heart |
| Interatrial Septum | Partition separating the atria |
| Interventricular Septum | Partition separating the ventricles |
| Lungs | Here the waste material (carbon dioxide) is exchanged for oxygen |
| Lymph Nodes | Small bodies composed of lymphoid tissue act as filters |
| Lymphatic System | Made up of the lymph nodes, spleen and the thymus gland |
| Mitral Valve | Between the left atrium and left ventricle |
| Pulmonary Valve | Between the right ventricle and pulmonary artery |
| Spleen | A non-vital organ located in the left abdominal cavity |
| Superior Vena Cava | Drains from upper portion of the body into the right atrium of the heart |
| Thymus Gland | Located between the lungs and plays an important role in the development of the immune system |
| Tricuspid Valve | Between the right atrium and right ventricle |
| Veins | Form a low-pressure collecting system to return the oxygen-depleted, waste-filled blood to the heart. |
| Venae Cavae | The largest veins |
| Ventricles | Blood pumping chambers of the heart |
| Venules | Smaller veins |
