★ Integumentary and Musculoskeletal Systems Quiz
Each movement that you consciously do, like walking, climbing, and punching, is enabled by the _____.
A. cardiac muscles
B. involuntary muscles
C. voluntary muscles
D. skin
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What is the substance within the epidermis which shields us from the harmful ultraviolet (UV) rays?
A. melanocytes
B. keratin
C. melanin
D. sebum
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