Weber Health Assessment Ch. 14: Skin + Hair +
Nails
Study online at https://quizlet.com/_6v3b1e
1. Function of Skin Largest organ of the body.
Immunity and Physical barrier - protects underlying tissues and organs
from:
-microorganisms,
-physical trauma,
-ultraviolet radiation,
-dehydration.
Temperature
maintenance.
Fuid and electrolyte balance.
Absorption and excretion.
Sensation - perceiving touch, pressure, temperature, and pain via the
nerve end- ings.
Vitamin D synthesis.
Individual identity to a person's appearance.
Three layers:
-epidermis,
-dermis,
-subcutaneous tissue
2. Epidermis Outer layer:
-almost completely replaced every 3 to 4 weeks
,Weber Health Assessment Ch. 14: Skin + Hair +
Nails
Study online at https://quizlet.com/_6v3b1e
-provide color and protection of upper skin
, Weber Health Assessment Ch. 14: Skin + Hair +
Nails
Study online at https://quizlet.com/_6v3b1e
*stratum corneum*
The most superficial layer of the epidermis consisting of dead cells
*stratum lucidum*
Clear, transparent layer of the epidermis under the stratum corneum
*stratum granulosum*
The layer of the epidermis that is composed of cells filled with keratin under
the stratum lucidum
*stratum germinativum*
-also known as the basal cell layer,
-the only layer that undergoes cell division and contains
*Melanocytes* - cells producing *melanin* (brown pigment) and
*Keratinocytes* - keratin-forming cells (cells containing protein).
3. Major functions 1) excreting uric acid, urea, ammonia, sodium, potassium, and other
of the
cutaneous metabolic wastes
gland 2) regulating temp through evaporation of perspiration
3) protecting against bacterial growth
4) softening, lubricating, and waterproofing skin/hair
5) resisting water loss from the skin surface in low-humidity environment
6) protecting deeper skin regions from bacteria
4. Dermis Sensitive inner mesodermic layer:
-vascularized
-papillary layer - fingerprints
, Weber Health Assessment Ch. 14: Skin + Hair +
Nails
Study online at https://quizlet.com/_6v3b1e
-reticular layer
-made mostly of connective tissue
-contains proteins, collagen, elastic fibers, nerve endings, and lymph vesse
-origin of glands and follicles
*Sebaceous glands*
-oil glands
-distributed over most of the body except the palms of the hands and soles
of the feet
-produce *sebum*:
••• oily secretion;
••• composed of fat and keratin;
••• waterproofs the hair and skin;
••• has some fungicidal and bactericidal ettects
••• *usually released into hair follicles*
*Sweat glands*
-secrete a mixture of water, dissolved salts, and urea via sweat pores
-may be *eccrine* (produce a thin, watery secretion) or *apocrine* (secrete
thicker sweat)
*eccrine glands* (*e*verywhere)
-over the entry skin
-for termoregulation
-produce clear perspiration (water and salts)
-released into funnel-shaped pores at skin's surface
-Perspiration decreases with aging because sweat gland activity decrease
*apocrine glands*
-found primarily in the axillary and anogenital regions:
••• Axilla (underarm)
••• Perianal (near the anal area)
Nails
Study online at https://quizlet.com/_6v3b1e
1. Function of Skin Largest organ of the body.
Immunity and Physical barrier - protects underlying tissues and organs
from:
-microorganisms,
-physical trauma,
-ultraviolet radiation,
-dehydration.
Temperature
maintenance.
Fuid and electrolyte balance.
Absorption and excretion.
Sensation - perceiving touch, pressure, temperature, and pain via the
nerve end- ings.
Vitamin D synthesis.
Individual identity to a person's appearance.
Three layers:
-epidermis,
-dermis,
-subcutaneous tissue
2. Epidermis Outer layer:
-almost completely replaced every 3 to 4 weeks
,Weber Health Assessment Ch. 14: Skin + Hair +
Nails
Study online at https://quizlet.com/_6v3b1e
-provide color and protection of upper skin
, Weber Health Assessment Ch. 14: Skin + Hair +
Nails
Study online at https://quizlet.com/_6v3b1e
*stratum corneum*
The most superficial layer of the epidermis consisting of dead cells
*stratum lucidum*
Clear, transparent layer of the epidermis under the stratum corneum
*stratum granulosum*
The layer of the epidermis that is composed of cells filled with keratin under
the stratum lucidum
*stratum germinativum*
-also known as the basal cell layer,
-the only layer that undergoes cell division and contains
*Melanocytes* - cells producing *melanin* (brown pigment) and
*Keratinocytes* - keratin-forming cells (cells containing protein).
3. Major functions 1) excreting uric acid, urea, ammonia, sodium, potassium, and other
of the
cutaneous metabolic wastes
gland 2) regulating temp through evaporation of perspiration
3) protecting against bacterial growth
4) softening, lubricating, and waterproofing skin/hair
5) resisting water loss from the skin surface in low-humidity environment
6) protecting deeper skin regions from bacteria
4. Dermis Sensitive inner mesodermic layer:
-vascularized
-papillary layer - fingerprints
, Weber Health Assessment Ch. 14: Skin + Hair +
Nails
Study online at https://quizlet.com/_6v3b1e
-reticular layer
-made mostly of connective tissue
-contains proteins, collagen, elastic fibers, nerve endings, and lymph vesse
-origin of glands and follicles
*Sebaceous glands*
-oil glands
-distributed over most of the body except the palms of the hands and soles
of the feet
-produce *sebum*:
••• oily secretion;
••• composed of fat and keratin;
••• waterproofs the hair and skin;
••• has some fungicidal and bactericidal ettects
••• *usually released into hair follicles*
*Sweat glands*
-secrete a mixture of water, dissolved salts, and urea via sweat pores
-may be *eccrine* (produce a thin, watery secretion) or *apocrine* (secrete
thicker sweat)
*eccrine glands* (*e*verywhere)
-over the entry skin
-for termoregulation
-produce clear perspiration (water and salts)
-released into funnel-shaped pores at skin's surface
-Perspiration decreases with aging because sweat gland activity decrease
*apocrine glands*
-found primarily in the axillary and anogenital regions:
••• Axilla (underarm)
••• Perianal (near the anal area)
