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 Autonomous 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 Nutrition and Metabolism7
- Ch. 24 The Urinary System39
- Ch. 25 Fluids, Electrolytes, and Acid-Base Homeostasis39
- Ch. 26 The Reproductive System10
- Ch. 27 Development and Heredity5
Chapter 5, Problem 7a
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.
Verified step by step guidance1
Step 1: Understand the role of melanocytes in the epidermis. Melanocytes are specialized cells located in the basal layer of the epidermis responsible for producing melanin, the pigment that gives skin its color and provides protection against UV radiation.
Step 2: Clarify the composition of the epidermis. The bulk of the epidermis is made up of keratinocytes, which are cells that produce keratin, a protein that provides strength and waterproofing to the skin.
Step 3: Evaluate the statement. The statement 'Melanocytes account for the bulk of the epidermis' is false because melanocytes are not the predominant cell type in the epidermis; keratinocytes are.
Step 4: Correct the false statement. A true version of the statement would be: 'Keratinocytes account for the bulk of the epidermis, while melanocytes are specialized cells located in the basal layer of the epidermis.'
Step 5: Review the corrected statement and ensure understanding of the roles of keratinocytes and melanocytes in the epidermis.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Epidermis Structure
The epidermis is the outermost layer of the skin, primarily composed of keratinocytes, which are responsible for forming a protective barrier. Melanocytes, which produce the pigment melanin, are present in much smaller numbers compared to keratinocytes, making up about 5-10% of the cells in the epidermis.
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The Epidermis: Layers Example 2
Melanocytes Function
Melanocytes are specialized cells located in the basal layer of the epidermis that produce melanin, the pigment responsible for skin color. Their primary function is to protect the skin from UV radiation by absorbing harmful rays, thus playing a crucial role in skin health and pigmentation.
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True/False Statement Correction
In evaluating true or false statements, it is essential to understand the factual basis of the claim. In this case, the statement 'Melanocytes account for the bulk of the epidermis' is false; a correct statement would be 'Keratinocytes account for the bulk of the epidermis, while melanocytes are present in smaller numbers.'
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Related Practice
Textbook Question
Number the strata of thick skin epidermis from deepest (1) to most superficial (5).
____Stratum spinosum
____Stratum corneum
____Stratum basale
____Stratum lucidum
____Stratum granulosum
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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.
Merkel cells produce the pigment melanin.
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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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Textbook Question
Which of the following statements is false?
a. Thin skin lacks the stratum lucidum, whereas thick skin has all five epidermal layers.
b. Thick skin is located on the palms, the palmar surfaces of the fingers, the soles of the feet, and the plantar surface of the toes, whereas thin skin is located everywhere else.
c. Thick skin has numerous hairs, whereas thin skin lacks hairs.
d. Thin skin has a thin stratum corneum, and the other layers are thinner than what we find in thick skin.
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