Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
Skin
|
largest organ
accounts for 7% of body weight fixes itself serves as protection |
|
|
Layers of skin
|
Epidermis
dermis hypodermis |
|
|
Dermis
|
has nerve cells and glands
|
|
|
hypodermis
|
deep in the dermis made of adipose tissue, insulation and heat loss
|
|
|
Functions of skin and hypodermis
|
Cushions and insulates deeper organs
protects body from bumps, scrapes, cuts, chemicals, heat and cold. Mini - excretory system screens out UV rays Sensory receptorswith nerve endings |
|
|
Deffinition of integumentary system
|
composed of skin, hair, nails, sweat, oil and mammary glands
|
|
|
Epidermis cell types
Stratified squamos epithelial cells |
Keratinocytes/keratin
Melanocytes/melanin Merkel Cells/nerve endings langerhans cells/immune system |
|
|
What type of cells do you loose with you age
|
langerhans cells
|
|
|
Keratinocytes
|
most abundant in epidermis
from deepest layer produce keratin - tough fibrous protein Produce antibodies and enzymens for protection dead cells at skins surface |
|
|
Layers os Epidermis
|
Stratum Basale (stratum geminativum)
Stratum Spinosum Stratum granulosum straum lucidum (only thick skin) stratum corneum |
|
|
What is the inner most layer
|
Stratum Basale
|
|
|
Characteristics of stratum basale
|
deepest layer
attached to dermis cells/keratinocytes divide |
|
|
what type of cells are in the stratum basale
|
merkel cells - sensory nerve endings
melanocytes - pigment melanin |
|
|
Characteristics of stratum spinosum (spiny Layer)
|
Spiny apperance by artifacts of hitological perp.
Tick bundles of tonofillaments (part of cytoskeleten) for support star shaped langerhan cells |
|
|
Stratum granulosum
|
keratinocytes and tonofilaments
Tonofilaments contain keratohyaline granules & lamellated granules for waterproofing |
