Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
Increased amounts of blood flowing through the dermis lead to pallor in the skin.
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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 11a
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The primary skin pigment is melanin, which is derived from the amino acid tyrosine.
Verified step by step guidance1
Step 1: Understand the statement provided. The statement claims that melanin is the primary skin pigment and is derived from the amino acid tyrosine. Break this into two parts: (1) melanin as the primary skin pigment and (2) its derivation from tyrosine.
Step 2: Confirm the first part of the statement. Melanin is indeed the primary pigment responsible for skin color, produced by specialized cells called melanocytes in the epidermis. This part of the statement is true.
Step 3: Analyze the second part of the statement. Melanin is synthesized through a biochemical process that begins with the amino acid tyrosine. Tyrosine is converted into melanin via enzymatic reactions involving tyrosinase. This part of the statement is also true.
Step 4: Evaluate the overall accuracy of the statement. Since both parts of the statement are correct, the statement is true as written.
Step 5: If the statement were false, you would need to correct it. For example, if the statement incorrectly identified the primary pigment or its source, you would clarify that melanin is the primary pigment and is derived from tyrosine through enzymatic reactions.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Melanin
Melanin is the primary pigment responsible for the color of skin, hair, and eyes in humans and other animals. It is produced by specialized cells called melanocytes, which convert the amino acid tyrosine into melanin through a series of biochemical reactions. The amount and type of melanin produced determine an individual's skin tone and susceptibility to UV radiation.
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Other Epidermal Cells
Tyrosine
Tyrosine is a non-essential amino acid that plays a crucial role in the synthesis of melanin. It is derived from another amino acid called phenylalanine and is involved in various metabolic processes. In the context of skin pigmentation, tyrosine is the precursor that melanocytes use to produce melanin, highlighting its importance in determining skin color.
Skin Pigmentation
Skin pigmentation refers to the coloration of the skin, which is primarily influenced by the type and amount of melanin produced. Factors such as genetics, environmental exposure to sunlight, and hormonal changes can affect skin pigmentation. Understanding skin pigmentation is essential for recognizing variations in skin color and the implications for health, such as the risk of skin cancer.
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Related Practice
Textbook Question
Epidermal ridges are created by:
a. The epidermal papillae
b. Mounds of papillary dermis arranged into dermal ridges
c. Gaps between collagen bundles in the reticular layer
d. Tight binding of the reticular layer to deeper structures
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Textbook Question
What are the functions of the dermal papillae?
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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.
Melanin is produced by melanocytes and covers the nuclei of neighboring dendritic cells.
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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.
Carotene is a brown-black pigment that accumulates in the stratum corneum.
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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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