Chapter 4: The Integumentary System
Critical Thinking


What causes scar tissue to form as a severe skin wound heals?


What are pimples, whiteheads, and blackheads? How are they similar, and how do they differ?


Public opinion as to what constitutes a "healthy" appearance shifts periodically through history. Caucasian women with very pale skin were once thought to be the epitome of healthful attractiveness, but a deep tan is now widely considered desirable. In terms of actual health of the skin, which view is more accurate, and why?


A magician, claiming to have learned mystic secrets of self-healing in the Orient, pierces the skin of his palm with a needle without bleeding and apparently without pain. How is this possible?


Shampoos often contain a variety of exotic ingredients touted by promoters as being nutrient-rich and thus beneficial to the hair. Could there be any truth to such claims? Why or why not?

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