BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 28, Problem 10SA
Summary Introduction
Introduction:
Human skin contains special cells in different layers. These specialized cells secrete pigmented molecules under special conditions. These pigments benefit the skin and cells in different ways. Secretion of these pigments is greatly affected by exposure to sunlight.
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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 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
The layer of the skin composed of dense connective tissue that has projections known as papillae is the ____________.
A.
stratum corneum
B.
stratum basale
C.
dermis
D.
hypodermis
Chapter 28 Solutions
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Ch. 28 - _______ tissues are sheetlike with one free...Ch. 28 - _________ allow cardiac muscle cells to contract...Ch. 28 - Glands are derived from ________ tissue. a....Ch. 28 - Most ________ have many collagen and elastin...Ch. 28 - ________ is mostly plasma. a. Adipose tissue c....Ch. 28 - Prob. 6SACh. 28 - Cells of ________ can shorten contract. a....Ch. 28 - Prob. 8SACh. 28 - ________ detects and integrates information about...Ch. 28 - Prob. 10SA
Ch. 28 - Prob. 11SACh. 28 - Prob. 12SACh. 28 - Prob. 13SACh. 28 - Prob. 14SACh. 28 - Match the terms with the most suitable...Ch. 28 - Many people oppose the use of animals for testing...Ch. 28 - Prob. 2CTCh. 28 - Each level of biological organization has emergent...Ch. 28 - The micrograph to the left shows cells from the...
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- The _________ consists of many layers of dead squamous cells surrounded by lipids. A. dermis B. stratum corneum C. hypodermis D. stratum basalearrow_forward1. A) A major function of the skin is protection from ______. A. abrasion B. ultraviolet light C. entry of a microorganism D. dehydration E. All of the above B) What is one important function of melanin? A. Resets the diurnal biological clock B. Increases the amount of blood vessels C. Causes the skin to become cooler D. Absorbs harmful radiation E. Strengthens the skin or eyes C) Most of the cells of the epidermis are ________________. A. fibroblasts B. keratinocytes C. macrophages D. Langerhans cells D) The epidermis is nourished by diffusion from capillaries in the ___________. A. papillary layer of the dermis B. hypodermis C. epidermis D. reticular layer of the dermis E) Cell division occurs in which layer of the epidermis? A. Stratum lucidum B. Stratum corneum C. Stratum basale D. Stratum granulosum F) Which of the following is NOT…arrow_forwardCollagen lends ________ to the skin.a. elasticityb. structurec. colord. UV protectionarrow_forward
- Pigmentation of skin is due to: A. lymphocytes B. monocytes C. leucocytes D. melanocytesarrow_forwardThe epidermis is nourished by diffusion from capillaries in the ___________. A. hypodermis B. epidermis C. papillary layer of the dermis D. reticular layer of the dermisarrow_forwardA major function of the skin is protection from ______. A. abrasion B. ultraviolet light C. entry of a microorganism D. dehydration E. All of the abovearrow_forward
- Keratinization involves skin cells moving to the surface that have _________________. A. lost water and changed nuclei B. lost fat and increased mitochondria C. lost the stratum basale D. lost the stratum lucidum and increased the amount of protein, keratin E. None of the abovearrow_forwardThe hands and feet experience high amounts of abrasion. It contains so called thick skin having 5 epidermal strata. Which epidermal layer in thick skin consists of non-dead cells? a. stratum corneum b. stratum lucidum c. stratum granulosum d. a and b e. a, b, and carrow_forwardMost of the cells of the epidermis are ________________. A. Langerhans cells B. macrophages C. keratinocytes D. fibroblastsarrow_forward
- The skin dermis is composed of ________________________. A. elastic connective tissue B. fibrocartilage tissue C. adipose connective tissue D. dense irregular connective tissuearrow_forwardBasal cell carcinomas are the most common form of skin cancers in the United States and are frequently found on the head, neck, and arms. This cancer affects which cells? A. Langerhans cells of the stratum lucidum B. keratinocytes of the stratum spinosum C. melanocytes of the stratum basale D. basal cells of the stratum basalearrow_forwardFunctions of the skin include _____________ . a. excretion b. body temperature regulation c. sensory reception d. all of the abovearrow_forward
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