★ Circulatory & Respiratory System Quiz
Tiny blood vessels where exchange of materials take place. Oxygen dropped off to cells and carbon dioxide picked up.
A. arteries
B. capillaries
C. atria
D. veins
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Small air-sacs in the lungs that increase surface area for more absorption of oxygen into your blood and look like bunches of grapes surrounded by capillaries.
A. platelets
B. red blood cells
C. alveoli
D. trachea
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