Textbook Notes (363,419)
Canada (158,365)
HLTC22H3 (102)
Anna Walsh (49)
Chapter 5

Chapter 5 notes

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University of Toronto Scarborough
Health Studies
Anna Walsh

AGING OF THE SKIN AND MUSCULOSKELETAL SYSTEM SKIN - The skin provides covering for the body and is the first line of defence against bacteria, viruses and other types of environmental damage - The musculoskeletal system provide shape and support for the body, make movement and adjustments in position possible, protect the internal vital organs from external trauma - Skin and musculosketlal system (MS) provide the most obvious external signs of aging Basic anatomy and physiology - Skin is critical in temperature maintenance - Skin aids in homeostasis - Sensory nerves allow us to monitor the environment and warn us through pain - Aging of skin is most obvious clue to an individuals age - Skin is largest organ of body - Outermost layer of skin is called epidermis - Second layer is called the dermis, a layer of subcutaneous fat - Epidermis consists most of keratinocyte cell o Protect the skin and help heal it if its injured o Keratinocytes are necessary for the synthesis of vitamin D o Keratinocytes are found deep in the epidermis and rise to the surface (about 30 days) - Melanoctyes produce melanin for keratinocytes and give color to the skin o Make up 2% of the cells in the epidermis o Exposure to the sun increases melanin production - Langerhans cells are an important part of the immune system o Respond to toxic allergic stimuli - Dermis consists largely of collagen and elastin tissue o Blood vessels, pymphatic tissue, nerves, sweat glands and hair follicles o Cells in this layer include mast cells responsible for the skins ability to respond to toxic allergic stimuli - Under the dermis is the subcutaneous fat, consisting of adipocytes (fat cells) o Give shape and form to the body and provides protection and insulation Age-related changes - Changes in hair follicles result in graying and loss of hair - Wrinkles are due to decrease in subcutaneous fat layer and collegen & elastin - Decrease in the size and number of keratinocytes limits skins production of vitamin D - Turnover rate of keratinocytes in 50% - Decrease in melanocytes = disability to protect from the sun - Langerhans cells decrease by 40% - Dermis is 20% thinner - More likely to suffer from hypohyperthermia - Decreased sensitivity to touch, heat, cold, injury www.notesolution.com
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