Which of the following symptoms may indicate hypoxia?

Question

Quiz BPL Hot Air - Balloon Pilot License - Human Performance and limitations - Which of the following symptoms may indicate hypoxia?

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Blue discolouration of lips and fingernails

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Blue marks all over the body

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Muscle cramps in the upper body area

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Joint pain in knees and feet

BPL Hot Air: Which of the following symptoms may indicate hypoxia?