Unit 3 Day 3 One man with courage makes a majority. Andrew Jackson

Today’s Agenda Review layers of skin by matching Complete & Turn in your epidermis diagram Notes on skin color, hair follicles

Skin color is affected by Melanin—amino acid polymer that ranges in color from orange to brown. Carotene—yellow to orange in color and found in stratum corneum of palms and soles of feet. Hemoglobin—adds pinkish hew, especially in Caucasian skin.

Changes in Color Redness—embarrassment, hypertension, fever, inflammation, allergy. Erythema Pallor—blanching—fear, anger, emotions, anemia, low blood pressure Jaundice—yellowing—liver disorder, bile circulated in body causes color.

Change in Color Continued Bronzing—metallic—Addison’s disease, adrenocortex problems Black and Blue marks— bruises—sites where blood has escaped from vessels, aka hematoma, Vitamin C can reduce

Other changes Cyanosis---blue cast around lips, low O 2

Grade update

Unit 3 Day 4 There are many things we would throw away if we were not afraid others would pick them up. Wilde

This Week’s Agenda

Today’s Agenda Practice identifying the layers of skin. Daily Quiz Hair follicles, hair color Follicle labeling

Daily Quiz

Hair Follicle See Diagram

Hair Color: Hair Pigment—made by melanocytes at the base of the hair follicle and transferred to cortical cells. Different proportions of three types of melanin (brown, black, yellow) combine to form the various hair colors. Grey/white—decreased melanin, air bubbles replace it in shaft

Two main types of hair Vellus—fine body hair Terminal hair—darker, coarse, longer

Hair cont Hair influenced by hormones, diet Follicles alternate growth/rest –Ie-head follicles grow up to 4 yrs/rest –Eyebrow follicles only a few months

Hair growth cont. Thinning hair – reduced growth with age. Male pattern baldness– follicles grow hairs too short to emerge, those that do are vellus hairs. Minoxidil stimulates follicles to grow terminal hair

Sweat Glands – distributed all over body. (Sudoriferous) 1. Eccrine – more numerous –99% water –Palms, soles, forehead, etc 2. Apocrine—axillary and anogenital areas –Apocrine sweat contains fats & proteins

Sebaceous Glands (oil) Located all over body except palms and soles. Large on face/chest, small on body. Secrete oil called SEBUM Function; lubricate, prevent water loss