| A | B |
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| cardiovascular system | a collection of organs whose primary function is to transport blood to and from your body's cells ; the organs in this system include the heart, the arteries,and the veins |
| blood | a connective tissue made up of platelets, white blood cells, red blood cells, and plasma |
| arteries | blood vessels that carry blood away from the heart |
| capillaries | the smallest blood vessels in the body |
| veins | blood vessels that direct blood to the heart |
| pulmonary circulation | the circulation of blood between the heart and lungs |
| systemic circulation | the circulation of blood between the heart and the body (excluding the lungs) |
| blood pressure | the amount of force exerted by blood on the inside walls of a blood vessel |
| lymphatic system | a collection of organs whose primary function is to collect extracellular fluid and return it to its blood; the organs in this system include the lymph nodes and the lymphatic vessels |
| lymph | fluid and particles absorbed into lymph capillaries |
| lymph nodes | small, bean-shaped organs that contain small fibers that work like nets to remove particles from the lymph |
| thymus | a lymph organ that produces lymphocytes |
| spleen | an organ that filters blood and produces lymphocytes |
| tonsils | small masses of soft tissue located at the back of the nasal cavity, on the inside of the throat and at the back of the tongue |
| respiration | the exchange of gases between living cells and their environment; includes breathing and cellular respiration |
| respiratory system | a collection of organs whose primary function is to take in oxygen and expel carbon dioxide; the organs of this system include the lungs, the throat, and the passageways that lead to the lungs |
| pharynx | the upper portion of the throat |
| larynx | the area of the throat that contains the vocal cords |
| trachea | the air passageway from the larynx to the lungs |
| bronchi | the two tubes that connect the lungs with the trachea |
| alveoli | tiny sacs that form the bronchiole branches of the lungs |
