Anatomy of the skin
A thin, cellular membrane layer; containing keratin is called what?
Epidermis (first layer)
What is elastin?
Protein that is elastic and helps skin to return to its original position when pinched or poked.
About how many hairs are on the human head?
100,000
Where are nails located?
Fingers and toes
Where are the subaceous glands located?
Located in the dermal layer of the skin over the entire body with the exception of the palms, soles, and lips.
Dense, fibrous, connective tissue layer; containing collagen is called what?
Dermis (second layer)
What is collagen?
Fibrous protein material found in bone, cartilage, tendons, and ligaments.
Hair consists of tightly fused meshwork of cells filled with what hard protein?
Keratin
What is the growth rate for fingernails?
1mm per week
What is sebum and what does it do?
Sebum contains lipids and lubricates the skin and minimizes water loss.
Thick, fat - containing tissue
What am I?
Subcutaneous layer (third layer)
What are striae?
Striae, also known as stretch marks, are overstretching of the skin with weight gain may break the elastin fibers resulting in stretch marks.
What are hair follicles?
Sacs within each hair fiber grows
What is the lunula?
Half moon shaped whitish region at the base of the nail plate.
What are sweat glands and where are they on the body?
Tiny, coiled glands.
Found on almost all body surfaces (3000 per square inch)
What is the deepest layer of skin called?
Basal layer
What are fat cells called?
Adipocytes
How many hairs are on the human body?
Around 5 million
What is the cuticle?
A narrow band of epidermis (layer of keratin) is at the base and sides of the nail plate.
What does sweat consist of?
Almost pure water, with dissolved materials such as salt making up less than 1% of the total composition which is colorless and odorless.
Cells flatten, shrink, lose their nuclei, and die become a hard protein called?
Keratin
Why is this layer of the skin so important?
This layer of skin is important in protection of the deeper tissues of the body, as a heat insulator, and for energy storage
What is the hair growth rate per month?
1.3cm per month
What is the paronychium?
Soft tissue surrounding the nail border.
What gland secrete an odorless sweat, containing substances easily broken down by bacteria on the skin?
Apocrine sweat glands