| A | B |
|---|
| muscular organ the size of a closed fist located behind the sternum and between the lungs | heart |
| located between the right atrium and right ventricle | tricuspid valve |
| located between the left atrium and the left ventricle | bicuspid (mitral) valve |
| located between the right ventricle and the pulmonary artery and between the left ventricle and the aorta | semilunar valves |
| two-layer sac covering the heart | pericardium |
| one of the two layers of the pericardium that lies closest to the myocardium | visceral pericardium |
| one of the two layers of the pericardium that lines the pericaradial sac | parietal pericardium or epicardium |
| middle, thick, muscular layer of the heart | myocardium |
| inner lining of the heart | endocardium |
| tube-like structures that carry blood throughout the body | blood vessels |
| vessels that carry blood away from the heart. These vessels carry oxygen and other nutrients from the heart to the body cells | arteries |
| the smallest of arteries | arterioles |
| largest artery in the body | aorta |
| vessels that carry blood back to the heart. These vessels carry blood containing carbon dioxide and other waste products to the heart | veins |
| the smallest of veins | venules |
| largest vein in the body that carries blood to the heart from the body parts below the diaphragm | inferior vena cava |
| largest vein in the body that carries blood to the heart from the upper parts of the body | superior vena cava |
| microscopic blood vessels that connect arterioles with venules | capillaries |
| composed of plasma and formed elements such as erythrocytes, leukocytes and platelets | blood |
| liquid portion of blood in which cells are suspended | plasma |
| red blood cells that carry oxygen | erythrocytes |
| white blood cells that fight infection | leukocytes |
| one of the formed elements in the blood that is responsible for aiding in the clotting process | platelets, thrombocytes |
| the function of this system is to remove excessive tissue fluid | lymphatic system |
| the function of this system is to nourish the body by transporting nutrients and oxygen to the cells and removing carbon dioxide and other waste products | cardiovascular system |
| transparent, usually colorless tissue fluid | lymph |
| small, spherical bodies made up of lymphoid tissue acting as filters in keeping substances such as bacteria from the blood | lymph nodes |
| largest lymphatic organ located in the left side of the abdominal cavity between the stomach and the diaphragm | spleen |
| one of the primary lymphatic organs located anterior to the ascending aorta and posterior to the sternum between the lungs | thymus gland |
| this body part plays an important role in the development of the body's immune system | thymus gland |
