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integumentary
Question | Answer |
---|---|
what is the basic structure of skin | epidermis, dermis, subcutaneous layer |
what is the epidermis made of | stratified squamous epithelium, connects to underlying dermis via basement membrane |
what is the dermis made of | deep to the epidermis made of mostly areolar connective tissue |
what is the subcutaneous layer made of | deeper than the dermis, made of mostly adipose, not actually part of the skin |
what are the basic functions of the skin | maintain homeostasis, regulate body temp, protect underlying tissues, slowing water loss, housing sensory receptors, synthesize vitamin d, excrete of urea |
what is the function of the epidermis | protection against water loss, mechanical injury, chemicals, and microorganisms |
what are the 4/5 layers of epidermis | stratum corneum, stratum lucidim, stratum granulosum, stratum spinosum, stratum basale |
what is the stratum corneum made of | dead keratinocytes, protects against abrasion and microorganisms |
where is the stratum lucidum found | in thicker palms and soles, caluses |
what is the stratum basale made of | reproducing cells, gradually pushed up, cells dehydrate and fill with keratin, contains melanocytes |
what are the dermis functions | bind epidermis, dermal blood vessels nourish the epidermis, contains nerve fibers, increases SA |
what is the dermis made of | areolar, dense, and adipose tissue |
what is dermal papillae | projections of the dermis into the epidermis creating an uneven border |
what are the accessory structures of the skin | nails, hair follicles, sebaceous glands, sweat glands |
what is the nail consist of | nail plate, nail bed, half moon shaped lunula |
what is arrector pili | smooth muscle attatched to a hair folicle |
what is eumelanin | dark hair |
what is pheomelanin | blonde and red hair |
what are sebaceous glands | glands associated with hair follicles that secrete sebum |
what do sweat glands secrete | mostly water but some urea |
what are the types of sweat glands | eccrine, apocrine |
what is eccrine | respond to body temp |
what is apocrine | respond to body temp, stress, and sexual arousal |
what does ceruminous glands secrete | earwax |
what do mammary glands secrete | milk |
what is the most common skin cancer | basal cell carcinoma |
what is the least common skin cancer | malignant melanoma |
what is the skin cancer abcde | assymetrical, border, color, diameter, evolving |