immune cells found in the epidermis

layers of the skin

outermost layer of the skin composed of flattened and dead keratinocytes

layer of the dermis that contains collagen, 80% of skin, and elastic fibers, fibroblasts, blood vessels, sweat glands, and hair

2 types of sweat glands

layer of the dermis that contains finger-like projectionsthat houses blood vessels and nerve endings

two things that make up the hypodermis

translucent layer composed of flattened keratinocytes

outermost layer of the skin; avascular

5 cells of the skin

contains keratinocytes with spiky extensions (desmosomes) that provide strength and flexibility

thicker sweat with proteins

hypodermis layer consisting of fat cells

produces keratin, a fibrous protein that forms the structural basis of the epidermis

composed of keratin

densely packed keratin cells

keratinocytes start to lose their nucleus and produce keratin

stores excess energy in the form of fat

produces sebum that maintains moisture

continuous production of keratinocytes for the epidermis

aka as Sudoriferous Glands

functions of integumentary system (at least 3)

spiky extensions of stratum spinosum

highly vascularized connective tissue

produces melanin that absorbs harmful UV rays

synthesizes collagen and elastin fibers

5 layers of the epidermis

4 skin appendages

produces water & electrolytes, evaporative coolness by releasing water