Tom is in respiratory arrest due to an electrical shock. Why does a good samaritan have up to 4 or 5 minutes to begin CPR and save Tom's life?
A. There is a venous reserve of oxygen in Tom's blood.
B. There is reserve oxygen in Tom's lungs.
C. The Haldane effect lasts up to 5 minutes.
D. The ambient PO2 can support life that long.
E. Tom's hypoxic drive will keep him alive for up to 5 minutes.
Answer: A
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