integumentary system 4/29/2013. integumentary system skin-epidermis, dermis, hypodermis nails-nail...
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Integumentary System
4/29/2013
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Integumentary System
Skin-Epidermis, Dermis, Hypodermis Nails-Nail Roots, Keratin in Nails Hair-Hair Follicles, Keratin in Hair Glands-Sweat Glands, Sebaceous
Glands, Sebum, Perspiration
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Skin
Epidermis- The epidermis is the outermost layer of skin and it contains a lower layer of rapidly dividing cells that push cells upward as they die, and they begin to produce keratin forming the exposed layer of skin.
Dermis-The dermis is the inner middle layer of skin that contains collagen fibers, blood vessels, nerve endings, glands, sensory receptors, smooth muscles, and hair follicles.
Hypodermis- The Hypodermis is a subcutaneous layer of fat and loose connective tissue which helps to insulate the body.
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Nails
Nail Root- this is an area of rapidly diving cells near the tip of the nails on the toes and fingers.
Keratin in Nails-The keratin in nails is produced in the cells of the nail root and makes the nails strong, waterproof, and plate-like.
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Hair
Hair Follicles- these are tube-like pockets of epidermal cells that make up hair and they are located in the dermis.
Keratin- Keratin is in all the dead cells of hair, making it flexible and strong.
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Glands
Sweat Glands- Sweat glands secrete sweat which includes excess salt and water, and wastes from blood cells. By secreting sweat, the body loses heat.
Sebaceous Glands- Sebaceous Glands secrete sebum, which spreads across the surface of the skin and helps the epidermis stay waterproof and flexible.
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Functions of Integumentary System
Protects body against infection and injury
Regulates body temperature Removes waste products from body Protects body from ultraviolet rays
of the sun.
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Protection From Infection and Injury
Rapid Cell Growth Production of Keratin Sebaceous Gland Production Of
Sebum
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Regulation of Body Temperature
Narrowation of blood vessels Expansion of Blood Vessels Sweat Gland Production of
Perspiration
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Removal Of Waste
Shedding/Washing of Dead Cells from Body
Secretion of Perspiration
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Providing Protection From Ultraviolet Rays
Melanocytes Melanin
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Relationships With Other Systems
Nervous System-sensory receptors, nerve endings
Circulatory System-blood vessel expansion/narrowation
Excretion System-secretion of perspiration
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Medical Problems
Psoriasis Alopecia
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Pictures Of Psoriasis
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Pictures Of Psoriasis
Severe case
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Pictures of Alopecia
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Pictures of Alopecia
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Integumentary System