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Questions and Answers
Which layer of the skin is composed of connective tissue?
Which layer of the skin is composed of connective tissue?
Which of the following is NOT an appendage of the skin?
Which of the following is NOT an appendage of the skin?
What is the specific function of the skin that involves regulation of body temperature?
What is the specific function of the skin that involves regulation of body temperature?
Which of the following is the main function of blood?
Which of the following is the main function of blood?
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What is the approximate percentage of plasma in centrifuged blood sample?
What is the approximate percentage of plasma in centrifuged blood sample?
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Which of the following is NOT a formed element of blood?
Which of the following is NOT a formed element of blood?
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Where does haemopoiesis primarily occur in adult life?
Where does haemopoiesis primarily occur in adult life?
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Which layer of the skin is responsible for the color of the skin?
Which layer of the skin is responsible for the color of the skin?
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What is the role of melanocytes in the skin?
What is the role of melanocytes in the skin?
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Where are Langerhans cells typically located in the skin?
Where are Langerhans cells typically located in the skin?
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What is the function of Merkel cells in the skin?
What is the function of Merkel cells in the skin?
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Which layer of the skin contains a rich network of blood and lymphatic vessels?
Which layer of the skin contains a rich network of blood and lymphatic vessels?
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Which layer of the skin is responsible for thermoregulation?
Which layer of the skin is responsible for thermoregulation?
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Which type of sensory receptor is associated with sensing an object's texture?
Which type of sensory receptor is associated with sensing an object's texture?
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Which encapsulated receptor is stimulated by stretch or twisting in the skin?
Which encapsulated receptor is stimulated by stretch or twisting in the skin?
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Which layer of the epidermis is only found in thick skin?
Which layer of the epidermis is only found in thick skin?
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What is the major distinction between thick skin and thin skin?
What is the major distinction between thick skin and thin skin?
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What is the most abundant cell type in the epidermis?
What is the most abundant cell type in the epidermis?
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What are the characteristic features of cells in the granular layer of the epidermis?
What are the characteristic features of cells in the granular layer of the epidermis?
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Which layer of the hair shaft is responsible for giving hair its color?
Which layer of the hair shaft is responsible for giving hair its color?
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Where are lamellated (Pacinian) corpuscles located?
Where are lamellated (Pacinian) corpuscles located?
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Which skin appendage is responsible for causing hair to stand on end?
Which skin appendage is responsible for causing hair to stand on end?
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Which region of the body does not have hair follicles?
Which region of the body does not have hair follicles?
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Study Notes
Structure and Function of Skin and Skin Appendages
- Lamellated (Pacinian) corpuscles are large oval structures located deep in the reticular dermis and hypodermis, and they are responsible for sensing coarse touch, pressure, and high-frequency vibrations.
- Hair follicles are invaginations of the epidermis that form within the skin and are found all over the body except for the glabrous skin of the palms, soles, lips, glans penis, clitoris, and labia minora.
- The hair bulb, located at the base of the hair follicle, contains cells that divide and differentiate to form the hair shaft.
- The hair shaft is composed of three concentric layers: the medulla, cortex, and cuticle, which are formed by keratinocytes in the hair bulb.
- The hair follicle is surrounded by an epithelial root sheath and a connective tissue sheath, and it is anchored to the dermis by the dermal papilla.
- The arrector pili muscle is a small bundle of smooth muscle cells that connects the hair follicle to the dermal papillary layer and is responsible for causing hair to stand on end (goosebumps).
- Nails are hard plates of keratin on the dorsal surface of each distal phalanx, formed by the nail matrix in a process similar to the stratum corneum and hair.
- Sebaceous glands secrete oily sebum into the space around the hair root and are found in the dermis over most of the body, except for the thick skin of the palms and soles.
- Eccrine sweat glands are long epidermal invaginations embedded in the dermis, and they are most numerous on the foot soles. They produce sweat for thermoregulation and excretion.
- Apocrine sweat glands are found in the axillary and perineal regions, and their secretion contains proteins and sebum. They are not fully developed until after puberty.
- Skin glands, including sebaceous and sweat glands, are innervated and have specific functions in maintaining the health and homeostasis of the skin.
- Skin and its appendages, such as hair follicles, nails, and glands, are important structures that play a role in sensory perception, thermoregulation, and protection.
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Description
Test your knowledge on the structure and function of skin and its appendages in this quiz. Learn about the different components of the skin, such as hair follicles, nails, and glands, and their roles in sensory perception, thermoregulation, and protection.
