5 layers of the epidermis Notes
1- Stratum corneum (horny layer)
- layer has many rows of dead cells filled with
- continuously shed and replaced
- effective barrier against light, heat and bacteria
- 20-30 cell layers thick
Cells in the epidermis Notes
Cells in the epidermis:
- Merkel cells
- Langerhans cells
1- Keratinocytes: most abundant
- produce keratin (fibrous protein)
- protective; waterproofing the skin
- continuous mitosis
- form in the
Functions of Hair Notes
Minor role in humans
Below the surface
Outermost layer of hair
Hair develops in follicles
Downward continuation of epidermis
Growth of Hair
The Integumentary System Notes
Skin has 2 layers
Epidermis - outer layer
Dermis inner layer
Sweat glands excrete sweat through pores.
Sweat is made up of urea, salts, and water.
Bodys first line of defense!
Largest organ of the body.
Epidermis and Dermis Notes
Epidermis is avascular (no blood vessels)
Dermis is highly vascular (has blood vessels)
Epidermis receives nourishment from dermis
Cells far away from nourishment die
Thick layer under the epidermis
Nail Structure Notes
The skin also helps control body temperature- Homeostasis!
When you sweat, heat leaves the body through your pores.
When the sweat hits the outer surface of the skin, it is
Functions of the Skin Notes
Storage of chemical compounds
Excretion of wastes
Synthesis of compounds
Outer layer of dead skin cells called cuticle .
Layer you see e
Integumentary System Notes
This system is divided into:
5- nerve endings
Skin is an organ because it consists of
tissues that are joined to perform a
Largest organ of the body in surf
Two types of glands Notes
Two types of glands exist in the integument.
- Sebaceous glands (oil glands)
- Sudoriferous glands (sweat glands)
Sebaceous glands: (holocrine glands)
- connected to hair follicle
- not found on palms and soles of feet