BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 28, Problem 14SA
Summary Introduction

Introduction:

Skin is made up of different types of cells that perform different functions. Some perform the secretory functions while others protect the inner layer of the cells. Hairs are keratin-rich, nonliving pertinacious structures present on the body surface.

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The accumulation of dead keratinocytes and the protein ____ on the skin surface forms a waterproof barrier. Choose one: A.keratin B.oil C.melanin D.collagen
Melanocytes and keratinocytes work together in protecting the skin from UV damage when keratinocytes ________ a.maintain the appropriate pH in order for the melanocyte to synthesize melanin granules. b.provide the melanocyte with nutrients necessary for melanin synthesis. c.maintain the appropriate temperature so the product of the melanocyte will not denature. d.accumulate the melanin granules on their superficial portion, forming a UV-blocking pigment layer.
The _________ consists of many layers of dead squamous cells surrounded by lipids.   A. dermis   B. stratum corneum   C. hypodermis   D. stratum basale
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