At which point(s) in the figure is blood oxygen- rich? 
A) points A and B
B) points A and D
C) point C only
D) points D and E
Correct Answer:
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Q11: During gas exchange,body cells
A)take up CO2 from
Q12: The oxygen- carrying component in red blood
Q13: Within the lungs,gas exchange occurs across
A)bronchi.
B)alveoli.
C)bronchioles.
D)diaphragms.
Q14: Which of the following is a function
Q15: What name is given to the sheet
Q17: Compared to the vital capacity,how much air
Q18: Cigarette smoking and secondhand smoke cause cancer
Q19: When you exhale,you
A)take up oxygen and release
Q20: In the countercurrent exchange system of fish
Q21: Which of the following animals requires the
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