OBJ: Given video, notes, activity sheet SWBAT describe the structures and functions of the skin with 70% accuracy.
BRING IN TEXTBOOKDN: Hand-in VKS Lab write-up and scantron.Video: The SKIN
ACT: Introduction to the Skin (Notes)Text, read p. 30-35;Work on iPad (eSpark Assignment)
HW: Complete The Skin Booklet; Work on SMSD Review Sheets; SMSD Exam, Feb 25; Winter Recess HW, NYSSAE 2008 Exam (on scantron, due Monday, Feb 23).
SKIN NOTES• SKIN FUNCTION
– Covers and protects from injury, infection, water loss
– Regulates body temperature– Removes waste (perspiration)– Collects environmental information– Produces Vitamin D– LARGEST ORGAN IN THE HUMAN BODY
Skin consists of:
epidermis – outer layer
dermis – inner layer
SKIN NOTESEPIDERMIS (OUTER LAYER):
No nerves, no blood vesselsUpper Epidermis (dead cell layer) – consists of dead cells which shed after two weeksLower Epidermis (skin producing factory) – consists of living epidermal cells which divide forming new cells. After two weeks, they die, move upward becoming part of the Upper Epidermis surface layer.
Function: protects, cushions, carries away bacteria, produces melanin.
Melanin – skin (color) pigment which protects against burning
SKIN NOTES
SKIN NOTESDERMIS: located below the epidermis and above
the fat layer** contains the nerves, blood vessels, sweat and
oil glands, hair follicle.
Sweat glands- produce perspiration (temperature regulation)Oil glands – waterproof hair and keeps skin moistHair follicle – site of hair growth
Below Dermis: Fat Layer, Muscle, Bone
SKIN NOTESSkin Health:
diet
keep clean and dry
limit sun exposure
See dermotologist every year to check skin for precancerous growths
Skin Cancer: over exposure to sunlight can damage skin cells where cells divide uncontrollably (basal cell carcinoma, squamous cell carcinoma, malignant melanoma).
Too much Sun: skin leathery and wrinkled
Dangerous MelonomaNote: black, dark brown color; irregular outline
Basal CellCarcinoma
pink, raised, blister; irregular outline
Squamous Cell Carcinomapink, raised, blister with central, depressed cavity; irregular outline
Skin Cancers
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