Disorders and Functions. THE Integumentary system . http://www.youtube.com/watch?v=MeTaBniB0ok We need a volunteer!! . The Structure of the Skin. The skin( cutaneous membrane) is the largest Organ and covers the entire surface of the body.
We need a volunteer!!
Found on all body parts except palms, soles of feet, lips, nipples, and portions of external reproductive organs
Hirstism- excessive body/facial hair
Hair follicle- Hairs project from these complex structures
Alopecia- hair loss
Arrectorpili- Smooth muscle that attaches to the follicle that causes the hair to stand on end. “Goose bumps”Hair
The skin is subject to many disorders, some more life threatening than others.
Athlete’s foot- Caused by a fungal infection, usually involves the skin of the toes and the soles.
Impetigo- A highly contagious disease occurring mostly in small children.
Psoriasis- A chronic condition, possibly hereditary, in which skin develops pink/reddish patches covered by silvery scales due to overactive cell division.
Eczema- Inflammation of the skin, caused by sensitivity to various chemicals.
Dandruff- A skin disorder caused by an accelerated rate of keratinization in certain areas of the scalp.
Urtiraria- Hives, caused by an allergic reaction.Disorders of the skin
Basal cell carinoma(non-melanoma) is the most common.
Is caused by UV radiation causing epidermal basal calles to form a tumor while suppressing the immune system’s ability to detect the tumor.
95% of patients cured by removing the tumor
Injury to the skin cause an inflamatory response. (Example: redness, swelling, heat, pain)
Fibroblasts bring about scar formation.
-An epidermal injury caused by heat.
-Two factors affect burn severity:
1. Depth of burn(can be classified by degree)
2. Extent of the burn area(can be estimated by of 9’s)Wound healing
·As you get older, the dermis becomes thinner and the epidermis is held less tightly and the skin loosens
·The adipose tissue in the hypodermis of the face and hands decrease
1. The elderly are more likely to feel cold
There is less collagen, and the fibers within the dermis become coarser, thicker, and farther apart
· The skin becomes wrinkled because
1. The epidermis is loose
2. There are less fiber, and the ones that do remain are disorganized
3. The hypodermis has less padding
· There are fewer blood vessels, less sweat glands, and the numbers of hair follicles decrease.
· The number of melanocytes decreases causing hair to turn grayThe Effects of aging
On the next slide, there is a list of 12 functions of the skin. Whoever can name 6 of them, gets 10 bonus points on the classwork!!!
Hypothermia- Below normal temperature; Hyperthermia- above normal temperature
Skin forms protective layer over entire body
Melanocytes protect from UV radiation
Dead skin cells protect from bacterial invasion
Helps regulate water loss
Assists the function of the urinary system(sensible/insensible perspiration)
Plays minor role in waste elimination
Produce Vitamin D
Useful to digestive and skeletal system
Only small amount of UV radiation is needed
Gather sensory information- specialized for touch, pain, heat(associated with nervous system)
Fingertips- greatest number of receptors
Helps regulate body temperatureH o m e o s t a s I s