Transcript BI 201 Human Anatomy & Physiology

BI 201 Human Anatomy & Physiology
What are the main layers of the Integ. System?
3 main layers:
_____________
Thin layer of _________
___________ epithelium
___________Thicker,
tough layer of _______
__________ connective
tissue and other
components
__________ Technically not part of the skin, varies in
thickness depending in part on the amount of
___________ present
BI 201 Human Anatomy & Physiology
What are the epithelial details?
• Most ___________ layer
• Comprised of stratified
squamous epithelium
• Most cells are
*_____________ (become
filled with keratin)
• Some cells are:
*___________ (give skin
it’s pigmentation)
*___________ (immune
cells)
• Outermost layer sloughs
off… takes ___ - ____ days
to replace
BI 201 Human Anatomy & Physiology
What are “mites and motes”?
Most of the dust floating in
sunbeams, covering the tops
of bookshelves etc. is
desquamated keratinocytes
(i.e. _______ _____ ____)
______ ______
(Dermatophagoides) eat
these cells.
House dust allergies are
generally Dust mite ______
_______________
BI 201 Human Anatomy & Physiology
Is the epidermis homogenous deep to superficial?
5 layers (strata)
_____
Deepest layer, mitosis, pushes
new cells upwards
During “histo-prep” cells
pull apart… still mitosis
________
__________
Keratohyalin granules,
lamellar bodies release
lipids
________
The cell dies, organelles
deteriorate leaving keratin
________
Thick layer of keratinized
(dead) cells that sloughs off
BI 201 Human Anatomy & Physiology
Take 5!!!
Some drugs are administered by
applying the drug to the skin
(ex., a nicotine patch). The drug
diffuses through the epidermis to
the blood vessels in the dermis.
What kind of substances can
pass easily through the skin by
diffusion? What kind have
difficulty?
Discuss with your
neighbor and predict
an answer.
BI 201 Human Anatomy & Physiology
Why are some people so “thick skinned”?
Thick and Thin skin refers to ________ ______ not
dermis or skin
Thick skin
BI 201 Human Anatomy & Physiology
Why are some people so “thick skinned”?
_____ ___: Not all 5 layers present, but hair is!
BI 201 Human Anatomy & Physiology
What are the Dermis Details?
• Contains all the
“goodies”
• 2 layers
_________ layer
_________ layer
Dermis is primarily what
type of tissue?
Consists of _________,
_________ ____ and
___________ and _____
What types of fibers?
_________
_________
_________
BI 201 Human Anatomy & Physiology
What are the Dermis Details?
2 layers
Reticular layer
Papillary layer
What is the function of the
papillae?
BI 201 Human Anatomy & Physiology
How, what, where and why do we have
“fingerprints”?
Epidermis of
some skin
follows contours
of __________
_________
______.
Is this in thin or
thick skin?
BI 201 Human Anatomy & Physiology
Are all incisions created equally?
___________ (cleavage) _____
The fibers in the dermis are not
arranged ___________ at
________. Greater strength in
“lines” due to orientation of
____________ ________.
Surgeons make incisions
parallel to tension lines
when possible
BI 201 Human Anatomy & Physiology
Is the skin equally strong in all directions?
________ (stretch marks)
As the skin is stretched
the dermis “ruptures” and
forms linear scars (____).
Striae gravidarum &
lineae albicantes
Let’s predict the orientation
of tension lines based on the
direction of striae!
BI 201 Human Anatomy & Physiology
Is the skin equally strong in all directions?
BI 201 Human Anatomy & Physiology
What are the Hypodermis Details?
• _________,
______ ____
(____ of body fat)
and macrophages
•Primarily ______
_________ tissue
•Also called
_____________ or
___________
tissue