integumentary system

keratinocytes

produces the protein keratin

melanocytes

produces pigmentation

merkel cells

sensory cells

langerhans cells

immune cells, detects foreign things that enter cell

what are the layers of the epidermis?

stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, and stratum basale

what are the layers of the dermis?

papillary and reticular

which cells are in the stratum corneum?

dead and flattened keratinocytes

what type of skin is the stratum lucidum located in?

thick skin (palms and soles of feet)

which cells are found in the stratum granulosum?

cells began to die and organelles disintegrate

which cells are found in the stratum spinosum?

keratinocytes, langerhans cells, and some melanocytes

which cells are found in the basale?

merkel cells and melanocytes.

what is the most superficial layer of the epidermis?

stratum corneum

what type of cells are found in the dermis?

fibroblasts

what type of tissue is the epidermis?

keratinized stratified squamous

what type of tissue is the papillary layer of the dermis?

loose areolar connective tissue

what type of tissue is the reticular layer of the dermis?

dense irregular connective tissue

which layer of the dermis is the most superficial?

reticular

merocrine secretion

cells release secretions into ducts (i.e. sweat glands)

apocrine secretion

secretion that forms a bud and then breaks off into duct (i.e. mammary gland, milk)

holocrine secretion

entire cell breaks down and releases contents into duct (i.e. oil glands)

sebaceous gland

oil gland

ceruminous gland

earwax

mammary gland

breast milk

apocrine sweat gland

strong hormones mixed with salt/bacteria on skin creates odor

where are apocrine sweat glands located?

axillary (armpit), groin, and nipples

what does the arrector pili muscle do?

goosebumps

functions of the integumentary system are….

physical protection

heat regulation

sensation

excretion (secretion)

nutrition (synthesis)