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Questions and Answers
What is the primary function of hair?
What is the primary function of hair?
Where are sebaceous glands typically found?
Where are sebaceous glands typically found?
Which type of sweat gland is most numerous in the palms and soles?
Which type of sweat gland is most numerous in the palms and soles?
Where do apocrine sweat glands open into?
Where do apocrine sweat glands open into?
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What is the reason for the differences in hair length between the back of the hand and pubic hair?
What is the reason for the differences in hair length between the back of the hand and pubic hair?
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Which type of gland produces sebum, an oily substance rich in lipids?
Which type of gland produces sebum, an oily substance rich in lipids?
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Which layer of the epidermis contains a translucent substance called eleidin?
Which layer of the epidermis contains a translucent substance called eleidin?
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What type of keratinocytes are predominantly found in the Stratum spinosum layer of the epidermis?
What type of keratinocytes are predominantly found in the Stratum spinosum layer of the epidermis?
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Which layer of the epidermis is known as the 'granular layer' due to the presence of keratohyaline granules?
Which layer of the epidermis is known as the 'granular layer' due to the presence of keratohyaline granules?
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What makes the Stratum corneum so strong according to the text?
What makes the Stratum corneum so strong according to the text?
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In which layer of the epidermis does desquamation, or shedding of dead skin cells, occur?
In which layer of the epidermis does desquamation, or shedding of dead skin cells, occur?
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Which layer of the epidermis is primarily composed of dead squamous cells filled with keratin?
Which layer of the epidermis is primarily composed of dead squamous cells filled with keratin?
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Which enzyme is lacking in individuals with albinism that affects the production of melanin?
Which enzyme is lacking in individuals with albinism that affects the production of melanin?
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What is the name for the type of hair that appears during the last trimester of fetal development?
What is the name for the type of hair that appears during the last trimester of fetal development?
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Which hormone contributes to men having more obvious hair growth?
Which hormone contributes to men having more obvious hair growth?
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What is the main type of hair that grows to a certain length and then ceases to grow?
What is the main type of hair that grows to a certain length and then ceases to grow?
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Which type of skin is thick and hairless, found on palms, soles, and flexor surfaces of digits?
Which type of skin is thick and hairless, found on palms, soles, and flexor surfaces of digits?
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What is the name of the fine, light-colored short hair found on the body?
What is the name of the fine, light-colored short hair found on the body?
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Where does each hair arise from in humans?
Where does each hair arise from in humans?
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Which hormone is involved in the growth cycle of hair in both men and women?
Which hormone is involved in the growth cycle of hair in both men and women?
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Study Notes
Hair Function and Types
- The primary function of hair is to protect the body from external damage.
- Lanugo is the type of hair that appears during the last trimester of fetal development.
- Vellus hair is the fine, light-colored short hair found on the body.
- Terminal hair is the main type of hair that grows to a certain length and then ceases to grow.
Glands
- Sebaceous glands, which produce sebum, an oily substance rich in lipids, are typically found in the dermis.
- Apocrine sweat glands open into hair follicles.
- Eccrine sweat glands are the most numerous type of sweat gland in the palms and soles.
Epidermis Layers
- The Stratum corneum, the outermost layer of the epidermis, is strong due to the presence of multiple layers of dead cells.
- The Stratum lucidum, a translucent layer of the epidermis, contains a substance called eleidin.
- The Stratum granulosum, also known as the 'granular layer', contains keratohyaline granules.
- The Stratum spinosum layer of the epidermis contains predominantly prickle cells.
- Desquamation, or shedding of dead skin cells, occurs in the Stratum corneum.
- The Stratum corneum is primarily composed of dead squamous cells filled with keratin.
Hair Growth and Development
- The growth cycle of hair is influenced by testosterone in men and is involved in hair growth in both men and women.
- The difference in hair length between the back of the hand and pubic hair is due to the variation in hair growth rates.
Skin Types
- Palmar skin, found on palms, soles, and flexor surfaces of digits, is thick and hairless.
Genetic Disorders
- Albinism is caused by a lack of the enzyme tyrosinase, which affects the production of melanin.
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Description
Explore the primary functions of hair, such as protection, touch sensation, and warmth. Learn about major glands like sebaceous glands and sweat glands, including eccrine and apocrine glands.
