Textbook Question
Which of the following is not a function of body hair in humans?
a. Protection from the environment
b. Sensation
c. Protection from mechanical trauma
d. Regulation of blood flow
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5. Integumentary System
Hair
Problem L2.3
Textbook Question
The hair and nails are sometimes called accessory organs. Are these structures technically organs? Why or why not?
Verified step by step guidance1
Understand the definition of an organ: In anatomy, an organ is defined as a structure composed of two or more tissue types that work together to perform a specific function.
Examine the structure of hair: Hair is primarily composed of keratinized epithelial cells, which form the hair shaft and follicle. It also includes associated structures like sebaceous glands and arrector pili muscles.
Examine the structure of nails: Nails are made of keratinized epithelial cells forming the nail plate, nail bed, and surrounding tissues such as the cuticle and nail matrix.
Determine if hair and nails meet the criteria for organs: Since both hair and nails involve multiple tissue types (e.g., epithelial tissue, connective tissue) and perform specific functions (e.g., protection, sensory input), they can be considered organs.
Conclude based on the analysis: Hair and nails are technically organs because they meet the anatomical definition of an organ by being composed of multiple tissue types and performing specific functions.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Definition of Organs
Organs are defined as structures composed of two or more types of tissues that work together to perform specific functions. In the human body, organs are typically recognized as part of organ systems, such as the heart in the circulatory system. Understanding this definition is crucial to determining whether hair and nails qualify as organs.
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Accessory Structures
Accessory structures are components that support the function of primary organs but do not perform essential life-sustaining functions on their own. Hair and nails are considered accessory structures of the integumentary system, which includes the skin. This classification helps clarify their role and whether they meet the criteria to be classified as organs.
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Tissue Composition
The composition of tissues is vital in classifying structures as organs. Hair is primarily made of keratinized cells, while nails are also composed of keratin. Since these structures lack the complex arrangement of multiple tissue types working together, they do not fit the traditional definition of an organ, which requires a more intricate organization.
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