skin P2 Flashcards
(25 cards)
where do you not find hair on the body
- palms
- soles
- lips
what is produced in a hair follicle
- dead keratinized cells
what is the accetor pili muscle
- a tiny muscle that attaches to the base of a hair follicle at one end and to dermal tissue on the other end.
- causes contractions ‘goosebumps’
- improves insulation
describe what root hair plexus are
- a collection of sensory nerves at the base of each hair follicle
- heightens sensation
describe what functions sebaceous glands have
- produce sebum
- nourishes hair shaft
- naturally moisturizes skin
- water repellent
what are apart of the accessory structures of hair
- arrector pili muscle
- root hair plexus
- sebaceous glands
what are the accessory structures of sweat glands
- eccrine
- apocrine
describe eccrine and functions
- found in most areas of the skin
- pour water secretions (directly onto skin surface)
- important for thermoregulation + excretion
- some antibacterial action
describe apocrine and function
- found in armpit, groin, and around the nipples
- secretes sticky/oily odorous secretions into base of hair follicles
- influenced by hormones
what are apart of the accessory structures of receptors
- tactile
- lamellar
- bulbous
what are apart of the accessory structures of nails
- protect fingertips/toes
- enhance sensation as it is a backboard
- sensation receptors require deformation
what happens to the skin when it ages
- epidermis and dermis thins (reduced collagen)
- slower skin repair
- drier epidermis (less sebum)
- impaired cooling (takes longer to cool down)
- less pigmentation
what happens to the skin if you are a smoker
- premature aging
- accelerates aging
- damages melatonin, collagen and elastin
- ## poor healing
what are melancytes
- makes melanin + puts it into the melanosomes
what is melanin
- is a pigment that absorbs UV light
- protects cells from UV damage
what are melanosomes and their function
- are vesicles that contain melanin
- takes/transfers melanin to the epidermal cells
where are melanocytes found
- in the stratum basale
- are not shedded
where are melanosomes found
- throughout the epidermis
- they shed with the keratinocytes
when does the density of the melanocytes varied
- throughout the body and through time
what is a mole
- cluster of melanocytes
- over-proliferation
what is a freckle
- when melanocytes produce too many melanosomes
- over-production
what is vitamin D essential for
- for calcium metabolism
- strong bones
if you have a vitamin D deficiency, what is the condition called
- rickets
what is required for vitamin D synthesis
- UV exposure in the skin
