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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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 4
Explain what happens to dermal blood vessels when heat needs to be conserved (i.e., due to a cold environment).
Verified step by step guidance1
Understand the role of dermal blood vessels in thermoregulation: Dermal blood vessels are part of the body's mechanism to regulate temperature. They can constrict or dilate to either conserve or release heat.
Identify the physiological response to cold environments: When the body is exposed to cold, it needs to conserve heat to maintain core temperature. This triggers a process called vasoconstriction.
Explain vasoconstriction: Vasoconstriction is the narrowing of blood vessels, particularly in the dermis. This reduces blood flow to the skin, minimizing heat loss to the external environment.
Describe the role of the sympathetic nervous system: The sympathetic nervous system activates vasoconstriction by releasing neurotransmitters like norepinephrine, which bind to receptors on the smooth muscle of blood vessels, causing them to contract.
Discuss the overall effect: By reducing blood flow to the skin, the body conserves heat and prioritizes maintaining warmth in vital organs, ensuring survival in cold conditions.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Vasoconstriction
Vasoconstriction is the process by which blood vessels narrow, reducing blood flow to the skin's surface. This physiological response occurs when the body needs to conserve heat, especially in cold environments. By limiting blood flow to the dermal blood vessels, the body minimizes heat loss, helping to maintain core temperature.
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05:07
Vasoconstriction & Vasodilation
Thermoregulation
Thermoregulation is the body's ability to maintain its internal temperature within a narrow range, despite external temperature fluctuations. It involves various mechanisms, including vasoconstriction and vasodilation, to either conserve or dissipate heat. This process is crucial for ensuring that enzymatic and metabolic functions operate optimally.
Recommended video:
01:07Introduction to Thermoregulation
Hypothalamus
The hypothalamus is a small region of the brain that plays a key role in regulating body temperature. It acts as the body's thermostat, detecting changes in temperature and initiating appropriate responses, such as vasoconstriction when the environment is cold. This ensures that the body can adapt to varying external conditions to maintain homeostasis.
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Guided course
6:11The Hypothalamus and Pituitary Gland Example 3
Related Practice
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
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
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.
Predict whether or not these substances are likely to be absorbed by 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.
Melanocytes account for the bulk of the epidermis.
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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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