Textbook Question
Which of the following is not a function of the integument?
a. Protection from mechanical trauma
b. Thermoregulation
c. Protection from acid-base imbalances
d. Vitamin D synthesis
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Ch. 5 The Integumentary System
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822
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Table of contents
- Ch. 1 Introduction to Anatomy and Physiology26
- Ch. 2 The Chemistry of Life38
- Ch. 3 The Cell55
- Ch. 4 Histology47
- Ch. 5 The Integumentary System30
- Ch. 6 Bones and Bone Tissue36
- Ch. 7 The Skeletal System40
- Ch. 8 Articulations19
- Ch. 9 The Muscular System36
- Ch. 10 Muscle Tissue and Physiology29
- Ch. 11 Introduction to the Nervous System and Nervous Tissue28
- Ch. 12 The Central Nervous System42
- Ch. 13 The Peripheral Nervous System41
- Ch. 14 The Autonomic Nervous System and Homeostasis31
- Ch. 15 The Special Senses39
- Ch. 16 The Endocrine System42
- Ch. 17 The Cardiovascular System I: The Heart30
- Ch. 18 The Cardiovascular System II: The Blood Vessels43
- Ch. 19 Blood32
- Ch. 20 The Lymphatic System and Immunity45
- Ch. 21 The Respiratory System27
- Ch. 22 The Digestive System27
- Ch. 23 Metabolism and Nutrition7
- Ch. 24 The Urinary System39
- Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Chapter 5, Problem L3.B5a
Many antiaging skin creams contain collagen and hyaluronic acid. Manufacturers claim that the collagen and hyaluronic acid applied to the surface of the skin will be absorbed into the dermis, where they will be incorporated into dermal tissue.
What are collagen and hyaluronic acid, and what are their functions?
Verified step by step guidance1
Collagen is a structural protein found in connective tissues, including the skin, tendons, and bones. It provides strength and elasticity to the skin, helping to maintain its firmness and resilience.
Hyaluronic acid is a glycosaminoglycan, a type of molecule that is highly effective at retaining water. It is naturally present in the skin and helps to keep it hydrated, plump, and supple by attracting and holding moisture.
Collagen functions as a key component of the extracellular matrix in the dermis, providing structural support and aiding in tissue repair. It also plays a role in maintaining the skin's elasticity and reducing the appearance of wrinkles.
Hyaluronic acid functions by binding to water molecules, creating a gel-like substance that fills spaces between collagen and elastin fibers in the dermis. This helps to maintain skin hydration and volume, contributing to a youthful appearance.
While collagen and hyaluronic acid are essential for skin health, their absorption through the skin's surface is limited due to the barrier function of the epidermis. Most topical products work by hydrating the outer layers of the skin rather than directly incorporating these molecules into the dermis.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Collagen
Collagen is a structural protein that forms the primary component of connective tissues in the body, including skin, tendons, and ligaments. It provides strength and elasticity, helping to maintain the skin's firmness and resilience. As we age, collagen production decreases, leading to wrinkles and sagging skin, which is why it is often included in anti-aging products.
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Hyaluronic Acid
Hyaluronic acid is a naturally occurring substance in the body, primarily found in connective tissues, skin, and cartilage. It is known for its remarkable ability to retain moisture, holding up to 1,000 times its weight in water. This property makes it essential for maintaining skin hydration, plumpness, and overall appearance, making it a popular ingredient in skincare formulations.
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Dermal Absorption
Dermal absorption refers to the process by which substances applied to the skin penetrate through the epidermis and into the dermis, where they can exert their effects. Factors influencing dermal absorption include the molecular size of the substances, the formulation of the product, and the condition of the skin barrier. Understanding this concept is crucial for evaluating the effectiveness of topical treatments like anti-aging creams.
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Related Practice
Textbook Question
Another feature of CIPA is anhidrosis, or the inability to sweat. Explain why Maria's inability to produce sweat could potentially be life-threatening.
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Textbook Question
After Ramon's skin came into contact with a poison ivy plant in biology lab, he developed a painful, itchy rash. However, after the skin of his colleague Cathy came into contact with snake venom in the lab, she developed no skin irritation. Poison ivy plants contain lipid-soluble oils, whereas snake venoms contain mostly water-soluble peptides. Explain why Ramon developed a rash, whereas Cathy did not.
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Textbook Question
You are working in the emergency department when paramedics rush in with an unconscious patient. You notice that the patient is wearing athletic clothing and the skin on his face and elsewhere on his body is bright red. The paramedics tell you that he was picked up after collapsing during a bike race. What does the color of the patient's skin tell you about the probable cause of his illness? Explain.
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Textbook Question
Many antiaging skin creams contain collagen and hyaluronic acid. Manufacturers claim that the collagen and hyaluronic acid applied to the surface of the skin will be absorbed into the dermis, where they will be incorporated into dermal tissue.
Are these substances polar or nonpolar?
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Textbook Question
Nguyen comes to your clinic with a mole that has recently changed in appearance. You examine the mole and note that its borders are irregular, it has a deep blue-black color, and the color is unevenly distributed throughout the mole.
What is your immediate concern? Why?
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