Integumentary System 4/29/2013. Integumentary System  Skin-Epidermis, Dermis, Hypodermis  Nails-Nail Roots, Keratin in Nails  Hair-Hair Follicles,

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Presentation transcript:

Integumentary System 4/29/2013

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

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.

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.

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.

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.

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.

Protection From Infection and Injury  Rapid Cell Growth  Production of Keratin  Sebaceous Gland Production Of Sebum

Regulation of Body Temperature  Narrowation of blood vessels  Expansion of Blood Vessels  Sweat Gland Production of Perspiration

Removal Of Waste  Shedding/Washing of Dead Cells from Body  Secretion of Perspiration

Providing Protection From Ultraviolet Rays  Melanocytes  Melanin

Relationships With Other Systems  Nervous System-sensory receptors, nerve endings  Circulatory System-blood vessel expansion/narrowation  Excretion System-secretion of perspiration

Medical Problems  Psoriasis  Alopecia

Pictures Of Psoriasis

Severe case 

Pictures of Alopecia

Integumentary System