A&P chapter 5- integumentary system Flashcards
what are the 2 major layers of the skin
dermis and epidermis
the stratum germinativum is where _____ takes place
mitosis
new cells from the stratum germinativum produce ____
keratin
what are defensins
antimicrobial peptides produced when the skin is injured
vit D is formed from ______ on exposure to the UV rays of sunlight
cholesterol
where is vitamin D converted to its most active form and where is excess formed
formed in the kidneys, stored in the liver
what is the stratum corneum
the outermost layers of dead cells.
what prevents loss of energy and entry of water and resists entry of chemicals and pathogens
keratin
what does the microbiota of the skin survive help to prevent
growth of pathogenic bacteria and fungi
what do Langerhans cells do
phagocytize foreign material, take it to LNs, and stimulate and immune response by lymphocytes
where are melanocytes found
lower epidermis
what is the dermis made of
fibrous connective tissue; collagen provides strength, and elastin provides elasticity
where does mitosis take place in the hair follicles
in the hair root
what detects touch, pressure, heart, cold, itch, pain on skin
receptors
what do sebaceous cells secrete into hair follicles or skin and what is the function
sebum; the fatty acids inhibit growth of some bacteria and prevent drying of skin and hair
