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  Aging affects the appearance of the skin producing wrinkles and sagging due to decreased collagen and elastin formation.  

  Acne is a disorder of the  

  The type of intercellular junction that forms tubular channels is  

  The tissue that forms the inner lining of the respiratory passages is  

  Apocrine sweat glands are most abundant on or in the  

  The differences among merocrine, apocrine, and holocrine secretions are the  

  Muscle cells with more than one nucleus are  

  The amount of keratin protein produced during keratinization determines hair color.  

  Of the four major types of membranes, the one consisting of dense connective tissue overlying loose connective tissue is  

  Epithelial tissue functions in