The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is ________ ?
Correct answer: C. Helium
- A. Argon
- B. Xenon
- C. Helium
- D. Krypton
Explanation
Helium is mixed with oxygen for deep-sea diving because it is much less soluble in body tissues than nitrogen and reduces nitrogen narcosis and decompression sickness. The other noble gases are unsuitable for this purpose.
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The human body is studied through its organ systems, including digestion, respiration, circulation, excretion, nervous coordination, reproduction and immunity. Coverage also includes nutrients and deficiency diseases, hormones, blood groups, common infections, vaccines, sanitation and basic first aid, while distinguishing communicable diseases from inherited and lifestyle disorders.
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