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 O2

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