Integumentary System
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| What is the largest organ in the body? | Skin
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| What are the two layers of the skin? | Epidermis and dermis
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| Epidermis | out layer that is composed of stratified squamous epithelium
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| Dermis | Inner layer that is thicker than the epidermis
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| What separates the two layers of the skin? | a basement membrane
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| What is the layer below the dermis that contains loose connective tissue and adipose tissue? | Subcutaneous Layer
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| What does the subcutaneous layer do? | binds the skin to underlying organs.
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| What are the characteristics of skin? | protective covering, prevents water loss, houses sensory receptors, synthesizes chemicals, excretes some waste, and helps regulate body temperature.
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| Which layer of the skin lacks blood vessels? | Epidermis
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| Which layer of the epidermis lies closest to the dermis with cells that are nourished by blood vessels. | Stratum basale
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| Where do the cells in the stratum basale go when they grow and divide? | Skin surface
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| What do the cells of the epidermis do when they die and what layer do they form? | Filled with keratin and form the stratum corneum.
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| What specialized cells in the epidermis produce the pigment melanin? | Melanocytes
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| Why are some people darker than others? | The melanocytes in their skin produce more melanin
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| What layer of the skin is composed largely of dense connective tissue mainly collagenous and elastic fibers? | Dermis
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| What does the dermis bind to underlying tissue? | Epidermis
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| What kind of fibers are scattered throughout the dermis? | Nerve fibers
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| The dermis contains hair follicles and what two glands? | Sebaceous and sweat glands.
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| The subcutaneous layer is also called the? | Hypodermis
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| This layer contains what? | Major blood vessels
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| On what skin surfaces is hair not present? | Palms, soles, nipples ,and external reproductive parts.
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| Hair follicle | A group of epidermal cells that from at the base of a tube-like depression
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| Sebaceous glands are what kind of gland? | Exocrine
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| What does a sebaceous gland secrete? | sebum
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| What does sebum do to the hair? | keeps it soft, pliable, and waterproof.
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| What kinds of tissue are nails made of? | Keratinized stratified squamous epithilial.
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| What is the name of the half white moon-shaped area at the based of the nail? | Lanula
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| What is the lanula? | The most active growing region
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| What is the most numerous sweat gland in the skin? | Eccrine gland
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| What do the Eccrine glands respond to? | Body temperature
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| What is sweat secreted into? | Pore
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| What sweat glands are activiated by emtional upset or fear? | Aprocrine Glands
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| What gland secrete ear wax? | Ceruminous Glands
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