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Ch. 5 The Integumentary System
Marieb - Human Anatomy & Physiology 11th Edition
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMarieb, Hoehn 11th EditionCh. 5 The Integumentary SystemProblema 1
Capitolo 5, Problema 1

Which epidermal cell type is most numerous?
a. Keratinocyte
b. Melanocyte
c. Dendritic cell
d. Tactile epithelial cell

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1
Understand that the epidermis is the outermost layer of the skin composed of several types of cells, each with specific functions.
Identify the main types of epidermal cells: keratinocytes, melanocytes, dendritic cells (Langerhans cells), and tactile epithelial cells (Merkel cells).
Recall that keratinocytes are responsible for producing keratin, a protein that strengthens the skin and forms a protective barrier.
Recognize that keratinocytes make up the majority of the epidermal cells, far outnumbering melanocytes (which produce pigment), dendritic cells (immune function), and tactile epithelial cells (sensory function).
Conclude that the most numerous epidermal cell type is the keratinocyte.

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Epidermal Cell Types

The epidermis contains several specialized cell types, including keratinocytes, melanocytes, dendritic cells, and tactile epithelial cells, each with distinct functions such as protection, pigmentation, immune response, and sensation.
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Other Epidermal Cells

Keratinocytes

Keratinocytes are the most abundant cells in the epidermis, responsible for producing keratin, a protein that strengthens the skin and forms a protective barrier against environmental damage.
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04:22
Keratinocytes

Functions of Other Epidermal Cells

Melanocytes produce melanin pigment to protect against UV radiation; dendritic cells act as immune sentinels detecting pathogens; tactile epithelial cells are involved in sensory reception, but all are less numerous than keratinocytes.
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Other Epidermal Cells
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Domanda del libro di testo

Which is not a true statement about the papillary dermis?

a. It is largely areolar connective tissue

b. It is most responsible for the toughness of the skin

c. It contains nerve endings that respond to stimuli

d. It is highly vascular

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Domanda del libro di testo

The epidermis provides a physical barrier due largely to the presence of

a. Melanin

b. Carotene

c. Collagen

d. Keratin

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Domanda del libro di testo

Which cell functions as part of the immune system?

a. Keratinocyte

b. Melanocyte

c. Dendritic cell

d. Tactile epithelial cell

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