| A | B |
|---|
| trachea | windpipe; walls are reinforced with cartilage |
| larnyx | contains vocal cords |
| bronchi | two large tubes leading from the trachea to the lungs |
| bronchioles | very fine tubes that branch out from the bronchi |
| alveolus | microscopic air sacs; located at the end of the bronchioles |
| diaphragm | a sheet of muscle that separates the thoracic and abdominal cavities |
| hemocyanin | respiratory pigment that carries oxygen in mollusks and arthropods |
| hemoglobin | respiratory pigment in almost all vertebrates |
| lymphatic system | system of vessels and lymph nodes; returns interstitial fluid |
| artery | carries blood away from the heart |
| vein | has thin walls and valves to help prevent backflow of blood |
| capillary | blood travels slowly to allow for diffusion of nutrients and wastes |
| coronary circulation | where blood circulates in the heart |
| pulmonary circulation | where blood circulates in the lungs |
| hepatic circulation | where blood circulates in the liver |
| renal circulation | where blood circulates in the kidneys |
| systemic circulation | where blood circulates in the body |
| white blood cell | also called leukocyte |
| platelet | helps to clot blood |
| blood clotting | a complex process triggered by platelets and damaged tissue |
| sinoatrial node | pacemaker of the heart |
| red blood cell | contains hemoglobin and carries oxygen |
| blood | a connective tissues made up of plasma, RBC, WBC and platelets |
| atherosclerosis | hardening of the arteries due to the buildup of plaque |
