Textbook Question
Both newborn infants and aged individuals have very little subcutaneous tissue. How does this affect their sensitivity to cold environmental temperature?
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Ch. 4 Skin and Body Membranes
Marieb13th EditionEssentials of Human Anatomy & PhysiologyISBN: 9780135624340
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Table of contents
- Ch. 1 The Human Body: An Orientation23
- Ch. 2 Basic Chemistry22
- Ch. 3 Cells and Tissues20
- Ch. 4 Skin and Body Membranes13
- Ch. 5 The Skeletal System38
- Ch. 6 The Muscular System26
- Ch. 7 The Nervous System26
- Ch. 8 Special Senses12
- Ch. 9 The Endocrine System24
- Ch. 10 Blood22
- Ch. 11 Cardiovascular System29
- Ch. 12 The Lymphatic System and Body Defenses21
- Ch. 13 The Respiratory System7
- Ch. 14 The Digestive System and Body Metabolism13
- Ch. 15 The Urinary System23
- Ch. 16 The Reproductive System15
Marieb13th EditionEssentials of Human Anatomy & PhysiologyISBN: 9780135624340Not the one you use?Change textbook
Chapter 4, Problem 15
Name three changes that occur in the skin as one ages.
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Understand that aging affects the skin due to intrinsic factors (natural aging) and extrinsic factors (environmental exposure, such as UV radiation). These changes impact the structure and function of the skin.
Identify the first change: The epidermis (outer layer of the skin) becomes thinner over time, leading to a decrease in the skin's ability to protect against external damage and slower wound healing.
Recognize the second change: Collagen and elastin fibers in the dermis (middle layer of the skin) degrade, resulting in reduced elasticity and the formation of wrinkles.
Note the third change: Sebaceous glands produce less oil, leading to dryness and a decrease in the skin's ability to retain moisture.
Consider additional factors such as reduced melanocyte activity, which can cause uneven pigmentation or age spots, and discuss how these changes collectively impact the skin's appearance and function.
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Key Concepts
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Decreased Collagen Production
As individuals age, the skin's ability to produce collagen diminishes significantly. Collagen is a vital protein that provides structure and elasticity to the skin. This reduction leads to sagging, wrinkles, and a loss of firmness, making the skin appear older and less resilient.
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Thinning of the Epidermis
The epidermis, the outermost layer of the skin, becomes thinner with age. This thinning can result in increased fragility and susceptibility to injuries, as well as a decrease in the skin's ability to retain moisture. Consequently, older skin may appear more translucent and less vibrant.
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Decreased Sebum Production
Sebum is an oily substance produced by sebaceous glands that helps to keep the skin moisturized and protected. As people age, the production of sebum decreases, leading to drier skin. This lack of moisture can contribute to the appearance of fine lines and a rough texture, further emphasizing the signs of aging.
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Related Practice
Textbook Question
Match the appropriate structure with the proper description and/or function.
1. Made of dense, irregular connective tissue
2. Produce sebum
3. Helps regulate body temperature by producing sweat
4. Cause fingerprints
5. Houses the hair root
6. Superficial keratinized stratified squamous epithelium
7. Deep pressure receptors
8. Vascular layer that houses skin appendages
a. Dermal papillae
b. Lamellar corpuscles
c. Dermis
d. Hair follicle
e. Epidermis
f. Eccrine sweat gland
g. Reticular layer
h. Sebaceous glands
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Textbook Question
Roger, a 40-year-old man who loves spending time on the beach, is complaining to you that his suntan made him popular when he was young—but now his face is all wrinkled, and he has several darkly pigmented moles that are growing rapidly and are as big as large coins. He shows you the moles, and immediately you think “ABCDE.” What does that mean, and why should he be concerned?
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Textbook Question
Match the appropriate structure with the proper description and/or function.
1. Made of dense, irregular connective tissue
2. Produce sebum
3. Helps regulate body temperature by producing sweat
4. Cause fingerprints
5. Houses the hair root
6. Superficial keratinized stratified squamous epithelium
7. Deep pressure receptors
8. Vascular layer that houses skin appendages
a. Dermal papillae
b. Lamellar corpuscles
c. Dermis
d. Hair follicle
e. Epidermis
f. Eccrine sweat gland
g. Reticular layer
h. Sebaceous glands
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Textbook Question
From what types of damage does the skin protect the body?
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Textbook Question
More than one choice may apply.
Which layer of the heart wall is an endothelium?
a. Endocardium
b. Myocardium
c. Epicardium
d. Pericardium
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