When you hold your breath,which of the following blood gas changes leads initially to the urge to breathe again?
A) rising oxygen level
B) rising carbon dioxide level
C) falling oxygen level
D) rising carbon dioxide level and falling oxygen level
Correct Answer:
Verified
Q17: Which blood vessels have thin,leaky walls?
A)capillaries
B)venules
C)arteries
D)none of
Q19: Which one of the following is a
Q21: Leukemia _.
A)decreases the production of white blood
Q22: In the human respiratory system, gas exchange
Q23: Oxygen is mostly transported through the body
Q25: What structure do lobster use for gas
Q26: The _ provide(s)a common passageway for both
Q27: Gas exchange requires a surface that is
Q28: Examine the figure below.The one-way flow of
Q29: The following figure illustrates _. 
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