Transcript Unit 3 days 3 and 4

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