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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 |