★ Circulatory and Respiratory System Quiz
Your alveoli and capillaries work together to __________________.
A. produce mucus
B. transport oxygen into your lungs and carbon dioxide into yoru blood.
C. transport carbon dioxide into your lungs and oxygen into your blood.
D. help you breathe
Select your answer:
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Body Fluids & Circulation › ViewIn mammals, which blood vessel would normally carry the largest amount of urea?
A. Hepatic vein
B. Hepatic portal vein
C. Renal vein
D. Dorsal aorta
Physical › View
Cooling down helps our muscles to ?
A. Hurt
B. Warm-up
C. Relax
D. Go to sleep