Exposure to sunlight helps a person improve his health because ________?
Correct answer: D. The ultraviolet rays convert skin oil into Vitamin D
- A. Resistance power increases
- B. The infrared light kills bacteria in the body
- C. The pigment cells in the skin get stimulated and produce a healthy tan
- D. The ultraviolet rays convert skin oil into Vitamin D
Explanation
UVB radiation starts the production of vitamin D in the skin from a cholesterol-derived precursor, which supports bone health and calcium absorption. The option's reference to skin oil is an oversimplification, but it identifies the correct sunlight mechanism among the choices.
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About Human Body and Health
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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