Textbook Question
Explain what happens to dermal blood vessels when heat needs to be conserved (i.e., due to a cold environment).
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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 5
Number the strata of thick skin epidermis from deepest (1) to most superficial (5).
____Stratum spinosum
____Stratum corneum
____Stratum basale
____Stratum lucidum
____Stratum granulosum
Verified step by step guidance1
Understand that the epidermis of thick skin consists of five distinct layers, arranged from deepest to most superficial. These layers are: Stratum basale, Stratum spinosum, Stratum granulosum, Stratum lucidum, and Stratum corneum.
Identify the Stratum basale as the deepest layer. It is a single layer of cells that includes keratinocytes, melanocytes, and Merkel cells, and is responsible for cell division and regeneration.
Next, recognize the Stratum spinosum as the layer above the Stratum basale. It consists of several layers of keratinocytes connected by desmosomes, giving it a spiny appearance under a microscope.
Above the Stratum spinosum is the Stratum granulosum. This layer contains keratinocytes that begin to die and accumulate keratohyalin granules, which contribute to the waterproofing of the skin.
The Stratum lucidum is found only in thick skin (e.g., palms and soles) and lies above the Stratum granulosum. It is a thin, translucent layer of dead keratinocytes. The most superficial layer is the Stratum corneum, consisting of dead, flattened keratinocytes that form a protective barrier against environmental damage.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Epidermis Layers
The epidermis is the outermost layer of skin, composed of five distinct strata in thick skin. These layers include the stratum basale (deepest), stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum (most superficial). Each layer has unique characteristics and functions, contributing to the skin's overall health and protection.
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The Epidermis: Layers Example 2
Stratum Basale
The stratum basale, or basal layer, is the deepest layer of the epidermis where new skin cells are generated. It consists of a single row of columnar or cuboidal keratinocytes that are actively dividing. This layer is crucial for skin regeneration and contains melanocytes, which produce melanin, contributing to skin pigmentation.
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04:52Epidermal Layers: Stratum Basale (Basal Layer)
Stratum Corneum
The stratum corneum is the outermost layer of the epidermis, composed of dead, flattened keratinocytes that form a protective barrier. This layer is essential for preventing water loss and protecting underlying tissues from environmental damage. It is continuously shed and replaced, playing a vital role in skin homeostasis.
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03:18Epidermal Layers: Stratum Corneum
Related Practice
Textbook Question
Would a mild second-degree burn be likely to heal by regeneration or fibrosis? Would the same type of healing take place in a third-degree burn that involved muscle tissue? Why or why not?
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Textbook Question
The disease pemphigus vulgaris involves a patient's own immune system attacking the desmosomes between the epithelial cells of the skin. What changes would you expect to see with this disease?
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Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Melanocytes account for the bulk of the epidermis.
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Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Dendritic cells are phagocytes of the immune system that protect the skin and deeper tissues from invasion by pathogens.
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Textbook Question
Keratinocytes in the superficial strata of the epidermis die because:
a. They are too far away from the blood supply in the dermis.
b. They are surrounded by a lipid-based substance that makes them more permeable to water.
c. They do not die.
d. No keratinocytes in the epidermis are alive.
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