Textbook Question
Exposure to optimum amounts of sunlight is necessary for proper bone maintenance and growth in children.
(a) What does sunlight do to promote bone maintenance and growth?
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Ch. 5 The Integumentary System
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
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Table of contents
- Ch. 1 An Introduction to Anatomy and Physiology26
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization30
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure36
- Ch. 7 The Axial Skeleton11
- Ch. 8 The Appendicular Skeleton17
- Ch. 9 Joints13
- Ch. 10 Muscle Tissue12
- Ch. 11 The Muscular System28
- Ch. 12 Nervous Tissue18
- Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes22
- Ch. 14 The Brain and Cranial Nerves20
- Ch. 15 Sensory Pathways and the Somatic Nervous System17
- Ch. 16 The Autonomic Nervous System and Higher-Order Functions30
- Ch. 17 The Special Senses16
- Ch. 18 The Endocrine System20
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation29
- Ch. 22 The Lymphatic System and Immunity31
- Ch. 23 The Respiratory System12
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes32
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance23
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Not the one you use?Change textbook
Chapter 5, Problem 24
The fibrous protein that is responsible for the strength and water resistance of the skin surface is
(a) Collagen
(b) Eleidin
(c) Keratin
(d) Elastin
(e) Keratohyalin
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Understand the role of each protein listed in the options in relation to skin structure and function.
Recall that collagen is a fibrous protein primarily responsible for the strength and structural support of connective tissues, but it is located deeper in the dermis rather than the skin surface.
Recognize that elastin provides elasticity to tissues, allowing them to stretch and recoil, but it is not primarily responsible for water resistance.
Identify keratin as a fibrous protein found in the outermost layer of the skin (the epidermis), which provides both mechanical strength and water resistance to the skin surface.
Conclude that keratin is the correct protein responsible for the strength and water resistance of the skin surface.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Fibrous Proteins in the Skin
Fibrous proteins are structural proteins that provide strength, support, and protection to tissues. In the skin, these proteins contribute to its mechanical properties and barrier functions, making them essential for maintaining skin integrity and resilience.
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Keratin and Its Role in Skin
Keratin is a tough, fibrous protein found in the outer layer of the skin, hair, and nails. It provides strength and water resistance to the skin surface by forming a protective barrier that prevents water loss and protects against environmental damage.
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Other Skin Proteins: Collagen, Elastin, Eleidin, and Keratohyalin
Collagen provides tensile strength deeper in the skin, elastin allows skin elasticity, eleidin is a clear protein in the stratum lucidum aiding transparency, and keratohyalin granules help in keratinization. Each has distinct roles but keratin is key for surface strength and water resistance.
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Related Practice
Textbook Question
Why is it important for a surgeon to choose—when possible—an incision pattern according to the skin's tension lines?
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Textbook Question
List the four phases in the regeneration of the skin after an injury.
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Textbook Question
In clinical practice, drugs can be delivered by diffusion across the skin. This delivery method is called transdermal administration. Why are fat-soluble drugs more suitable for transdermal administration than drugs that are water soluble?