| A | B |
|---|
| capillaries | the smallest and most numerous vessels |
| hemoglobin | oxygen reacts with the iron in _____________ |
| Pulmonary arteries | contain blood high in carbon dioxide and low in oxygen |
| Blood | the main transport system for all body cells |
| platelets | a reduction in the number of ___________________ would cause severe bleeding |
| ventricles | Contractions of the ____________________ force blood through the body |
| aorta | carries blood that goes to all body organs except the lungs |
| red blood cells | most materials transported in the blood are carried in the ________________ |
| arteries | have the thickest muscular walls |
| red blood cells | carry oxygen in the blood |
| capillaries | oxygen enters the bloodstream through them |
| veins | usually contain blood high in carbon dioxide |
| arteries | receive blood from the ventricles |
| white blood cells | infection fighters |
| platelets | produce fibrin |
| lung capacity | the amount of air the lungs can holdalveoli |
| alveoli | air sacs surrounded by capillaries |
| pharynx | the area in the throat where the ears, nasal cavity, and mouth meet is called |
| diaphragm | the muscle that controls breathing |
| cells | where respiration takes place |
| tar | dark sticky substance produced when tobacco burns |
| diaphragm | air moves into the lungs primarily due to the action of rib muscles and the _____________ |
| vocal cords | organs that produce sound when moving air causes them to vibrate |
| bladder | a sac like muscular organ that stores urine |
| tar | coats the cilia of a smoker and causes them to clump together |
| bronchi | passages that direct air into the lungs |
| blood clots | platelets are cell fragments that help form__________________ |
| ventricles | The force of the heart's contracting _____________ causes blood pressure |
| artery | these walls must be very thick to because of the high force of blood pumped by the heart |
| capillaries | tiny vessesls where oxygen moves from the red blood cells into the body cells |
| heart attack | this occurs when the blood flow is cut of to a portion of the heart muscle |
| cholesterol | a waxy, fatlike substance that can build up in arteries |
| ventricles | the lower chambers of the heart |
| excretory system | gets rid of wastes in the body |
| respiratory system | this system is involved in the exchange of gases in the bloodstream |
| circulatory system | this system moves materials around the body in the blood |
| red blood cells | the most numerous blood cells; they give blood its color |
| white blood cells | fight infection |
| urine | nitrogen containing waste (urea) and water |
| artherosclerosis | a disease caused by cholesterol clogging the arteries |
