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1.
Oxygen moves easily out of blood capillaries into cells because ___________. (1 point)

the walls are very thin
because it is very small
because other gases push it out
cells need the oxygen

2.
Which of the following statements is false? (1 point)

Arteries carry blood away from the heart.
Veins carry blood back to the heart.
Capillaries and arteries are similar in size.
Blood travels from arteries to capillaries.

3.
The blood is transported to the left side of the heart from the ________ through the ___________ . (1 point)

lungs; aorta
body; pulmonary artery
body; vena cava
lungs; pulmonary vein

4.
______________ takes blood from the heart to the lungs and back again, while ____________ takes blood to and from tissues of the heart. (1 point)

Systemic circulation; coronary circulation
Pulmonary circulation; coronary circulation
Coronary circulation; systemic circulation
Systemic circulation; pulmonary circulation

5.
Blood is transported to the lungs through the __________ to collect __________ and remove _____________ . (1 point)

vena cava; carbon dioxide; oxygen
pulmonary artery; oxygen; carbon dioxide
pulmonary vein; nitrogen; oxygen
aorta; gas; water

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