×
Log in to StudySoup
Get Full Access to UM - HCS 212 - Class Notes - Week 2
Join StudySoup for FREE
Get Full Access to UM - HCS 212 - Class Notes - Week 2

Already have an account? Login here
×
Reset your password

UM / Health Care Sciences / HCS 212 / What is the most visible organ of the body?

What is the most visible organ of the body?

What is the most visible organ of the body?

Description

ul.lst-kix_v89z8wt25a5y-2{list-style-type:none}ul.lst-kix_v89z8wt25a5y-1{list-style-type:none}ul.lst-kix_v89z8wt25a5y-4{list-style-type:none}ul.lst-kix_v89z8wt25a5y-3{list-style-type:none}ul.lst-kix_v89z8wt25a5y-6{list-style-type:none}ul.lst-kix_v89z8wt25a5y-5{list-style-type:none}.lst-kix_1h0hb2m9uu46-8 > li:before{content:"- "}.lst-kix_bgajxzsqjifi-7 > li:before{content:"- "}ul.lst-kix_v89z8wt25a5y-8{list-style-type:none}ul.lst-kix_v89z8wt25a5y-7{list-style-type:none}.lst-kix_bgajxzsqjifi-8 > li:before{content:"- "}.lst-kix_1h0hb2m9uu46-2 > li:before{content:"- "}.lst-kix_1h0hb2m9uu46-0 > li:before{content:"- "}.lst-kix_1h0hb2m9uu46-1 > li:before{content:"- "}ul.lst-kix_v89z8wt25a5y-0{list-style-type:none}ul.lst-kix_1h0hb2m9uu46-8{list-style-type:none}ul.lst-kix_1h0hb2m9uu46-4{list-style-type:none}ul.lst-kix_1h0hb2m9uu46-5{list-style-type:none}.lst-kix_v89z8wt25a5y-0 > li:before{content:"- "}ul.lst-kix_1h0hb2m9uu46-6{list-style-type:none}ul.lst-kix_1h0hb2m9uu46-7{list-style-type:none}.lst-kix_v89z8wt25a5y-1 > li:before{content:"- "}.lst-kix_v89z8wt25a5y-3 > li:before{content:"- "}.lst-kix_v89z8wt25a5y-2 > li:before{content:"- "}.lst-kix_v89z8wt25a5y-5 > li:before{content:"- "}.lst-kix_1h0hb2m9uu46-3 > li:before{content:"- "}.lst-kix_1h0hb2m9uu46-4 > li:before{content:"- "}.lst-kix_1h0hb2m9uu46-5 > li:before{content:"- "}.lst-kix_v89z8wt25a5y-4 > li:before{content:"- "}.lst-kix_v89z8wt25a5y-8 > li:before{content:"- "}ul.lst-kix_1h0hb2m9uu46-0{list-style-type:none}ul.lst-kix_1h0hb2m9uu46-1{list-style-type:none}.lst-kix_1h0hb2m9uu46-6 > li:before{content:"- "}.lst-kix_1h0hb2m9uu46-7 > li:before{content:"- "}ul.lst-kix_1h0hb2m9uu46-2{list-style-type:none}.lst-kix_v89z8wt25a5y-7 > li:before{content:"- "}ul.lst-kix_1h0hb2m9uu46-3{list-style-type:none}.lst-kix_v89z8wt25a5y-6 > li:before{content:"- "}ul.lst-kix_bgajxzsqjifi-0{list-style-type:none}.lst-kix_bgajxzsqjifi-0 > li:before{content:"- "}.lst-kix_bgajxzsqjifi-1 > li:before{content:"- "}.lst-kix_bgajxzsqjifi-2 > li:before{content:"- "}.lst-kix_bgajxzsqjifi-3 > li:before{content:"- "}ul.lst-kix_bgajxzsqjifi-4{list-style-type:none}.lst-kix_bgajxzsqjifi-6 > li:before{content:"- "}ul.lst-kix_bgajxzsqjifi-3{list-style-type:none}ul.lst-kix_bgajxzsqjifi-2{list-style-type:none}ul.lst-kix_bgajxzsqjifi-1{list-style-type:none}.lst-kix_bgajxzsqjifi-4 > li:before{content:"- "}ul.lst-kix_bgajxzsqjifi-8{list-style-type:none}ul.lst-kix_bgajxzsqjifi-7{list-style-type:none}.lst-kix_bgajxzsqjifi-5 > li:before{content:"- "}ul.lst-kix_bgajxzsqjifi-6{list-style-type:none}ul.lst-kix_bgajxzsqjifi-5{list-style-type:none}

Ch. 4 - Integumentary System

  • Skin, hair, nails
  • Sweat, oil, mammary glands
  • Oil forms a layer even bacteria that gets trapped in skim & forms a pimple
  • sweat glands excrete water, ions, & some waste
  • math function is to maintain body temperature
  • Mammary glands (modified sweat glands) excrete milk
  • prolactin (hormone) synthesizes milk
  • oxytocin (from pituitary gland) is a hormone that helps in ejection of milk
  • Also secreted in birthing process
  • Skin is the most visible organ
  • can display signs of disease, but often not until the eater

Stages of the Disease If you want to learn more check out How can you think like an economist?
We also discuss several other topics like How many hours will take before the body of a person who passed away will be difficult to identify?

Structure / Function

  • Cutaneous Membrane - epidermis & dermis
  • Accessory structures a hair follicles, exocrine glands, nails
  • Wax in ears is secreted by a different gland “sebaceous glands"
  • Nails are remnants of evolutionary process
  • Outer layer of skin is mostly dead cells
  • Epidermis protects dermis from trauma / chemicals
  • Prevents water loss /entry of pathogens (except MRSA - can get into healthy skin)
  • Vit. D Synthesis
  • Sensory receptors - specialized cells that detect mechanical stimuli
  • each hair follicle has a nerve ending attached to movement & temperature (think goose bumps) can be detected
  • sets off Immune response to pathogens / cancers
  • Dermis- Papillary Layer & nourishment/support for epidermis
  • Reticular Layer Second protective layer against pathogens, lipid reserves skin attachment to other tissues, sensory receptors, thermoregulation
  • When body is heated, blood is diverted to skin to radiate heat out & away from organs
  • opposite when it's cold outside; blood (heat) stays toward core
  • Hair follicles ~ obviously ... produce hair to protect skull/ provide touch sensations of body surface
  • Glands (Exocrine) - thermoregulation, waste excretion, lubricates epidermis
  • Hypodermis - subcutaneous; deep to the dermis
  • Thin Skin all over except palms of hand soles a fat have thick
  • Skin → calluses
  • Thin skin: 4 cellular layers na
  • Thick skin: 5 cellular layers not much pigment in thick skin
  • Keratinocytes - most abundant in epidermis, produce Keratin
  • Melanocytes produce melanin pigment cells in deep epidermis
  • everyone has same amount, some people are more active
  • Merkell cells ~ sensory; have nerve ending to detect sensory stimuli
  • Langerhans cells ~ "fixed macrophages'' ~ eat pathogens that pass the epidermis
  • Layers of epidermis:
  • Stratum basale - a deepest layer where new cells come from constantly replicating
  • Stratum spinosum ~ “spiny layer” differentiation into Keratinocytes; melanocytes also seen here
  • become pigmented by melanocytes
  • Stratum granulosum - Keratin producing granules
  • Stratum lucidum - flattened, translucent, pack cells
  • Stratum corneum - superficial layer, dead cells

*Deepest to Most SuperficialWe also discuss several other topics like What is the difference between tactical/day-to-day hr and strategic hr?
Don't forget about the age old question of What is the meaning of technocracy?
Don't forget about the age old question of What is the embryonic root called?
We also discuss several other topics like What are some ways in which light interacts with matter?

  • Stratum Basale -active reproduction, location of melanocytes
  • Stratum spinosum - Keratinocytes bound by desmosome
  • St. Granulosum - Keratin production
  • S. Corneum- interlocking dead cells
  • Basale forms epidermal ridges extending into dermis (fingerprints)
  • Epidermal ridge forms fingerprints (see page din 21 in PPT)
  • many pores of sweat gland ducts
  • identical twins even have different fingerprints
  • Skin color comes from dermal blood supply (flushed in heat, pale in cold), concentrations of carotene /melanin, stratum corneum thickness.
  • Melanocytes infect pigment into Keratinocytes with them “tentacles"
  • Papillary Layer (Superficial) - dermal papillae, capillaries, nerve axons
  • Reticular Layer (deep) - Connective tissue, follicles, sweat /sebaceous glands
  • Collagen / elastin make skin stretchy / taut... lose production in late 20's →  wrinkles
  • wrinkles caused by age & UV light
  • Melanoma, skin cancer of melanocytes only one that can move to other organs of body
  • Stretch marks sudden growth & reticular fibers break
  • pregnancy, bodybuilding
  • when the fibers break, they don't recoil or rebond

Page Expired
5off
It looks like your free minutes have expired! Lucky for you we have all the content you need, just sign up here