27. Which body system coordinates the work of all other systems in the body?
A. Nervous System
C. Circulatory System
B. Digestive System
D. Respiratory System
28. What vitamin is synthesized when the skin is exposed to sunlight?
A. Vitamin C B. Vitamin D
C. Vitamin B1 D. Vitamin B9
A. Nervous System
C. Circulatory System
B. Digestive System
D. Respiratory System
28. What vitamin is synthesized when the skin is exposed to sunlight?
A. Vitamin C B. Vitamin D
C. Vitamin B1 D. Vitamin B9
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Answer:
27. A
28. B
Explanation:
27. Think of the brain as a central computer that controls all the body's functions. The rest of the nervous system is like a network that relays messages back and forth from the brain to different parts of the body. It does this via the spinal cord, which runs from the brain down through the back.
28. Vitamin D is a hormone, not a vitamin. The skin is responsible for producing vitamin D. During exposure to sunlight, ultraviolet radiation penetrates into the epidermis and photolyzes provitamin D3 to previtamin D3.
Answer:
27. A. Nervous System
28. B. Vitamin D