skin Flashcards
what is the integument system
a covering –> skin, hair, glands, etc.
what are the functions of the integument system (5)
barrier, vitamin D synthesis, sensation, thermoregulation, social clues
what are the 4 barriers of the integument system
1.) wear and tear barrier
2.) against water loss
3.) microorganisms
4.) ultra violet (UV) light
how does vitamin D synthesis occur
occurs in UV light by converting fatty molecules
what does sensation do in the integumentary system
gives information about the environment through receptors
what is thermoregulation
regulation of temperature (sweating/goosebumps)
what are the two layers of the integumentary system
epidermis and dermis
what is the epidermis made of
keratinized stratified squamous epithelium
what is the dermis made of
connective tissue
where does most mitosis occur
stratum basale
what are the cells found in the stratum basale
keratinocyte, merkel cell/tactile cell, and melanocyte
where are melanocytes found
the apical side of the nucleus
what does the activity level of melanocytes cause
color
what happens when melanocytes give up
cause pale/gray color
does mitosis occur in the stratum spinosum
minor mitosis
what causes the spines in stratum spinosum
desmosomes
what is the stratum granulosum layer described by
cells dying
what are keratohyaline granules
pre-keratin protein
what are lamellar bodies
oils
where is the stratum lucidum found
in thick skin only
what is the stratum corneum describe by
dead cells (bags of keratin)
what are the 2 layers of the dermis
papillary and reticular layer
what is the papillary layer made of
areolar connective tissue
what is the reticular layer made of
dense irregular tissue
