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Integumentary SystemChapter 5
Lesson 1Primary structures of the skin
Do Now
Read pg 93 Medical Focus: Body Art and answer the following questions:
What is tattooing?
Discuss two complications that can come from tattooing and piercing.
What two things can happen if a persons skin reacts to the ink?
Name 3 safety tips when getting pierced or tattooed.
Skin
Structure
Cutaneous membrane
Adults: 20.83 sq feet
Largest organ in the body
4 types of tissue: epithelial, connective, muscular, nervous
Epidermis = outer
Dermis = inner
Hypodermis = between skin and structures
EpidermisStructure
Outer
Thin
Epithelial tissue
No blood vessels
Tightly packed cells
3 layers
Stratum corneum
Stratum lucidum
Stratum basale
Stratum Corneum
Most superficial
WaterproofProtects from water loss/gain
Keratin (protein)
Protects from invaders
Stratum Lucidum
Protection from friction
Found in thick skinHands, feet elbows
Stratum Basale
Deepest layer
Produces new cells
Uses sensory nerves
Pain receptors send messages to the brain
Dermis
Inferior to epidermis
Dense connective tissue
Thick layer
Collagen and elastic fibers
Flexible
Blood vessels
Dermal Papillae: fingerlike tissue which anchors the dermis to the epidermis
Hypodermis
Below dermis
Between dermis and body structures (bones, tendons, muscles)
Loose connective tissue
Fat
Insulates body
Excess = obesity
Content Check
The deepest layer of the epidermis is the ____________________
Blood vessels can be found in:a) all 3 layers of skin
b) the dermis only
c) the hypodermis and dermis
Stratum basale
In class assignment
Read pg. 92 “I.C.E. – In Case of Emergency”
What is a first responders role in treating burns?What is the “rule of nines”What does “ABC” Stand for?Describe the difference between 1st, 2nd, and 3rd degree burns.What are the major complications of burns?
Hand in when done
Homework
Text pg. 96 “Study Questions” # 1-4
Lesson 2Analyzing fingerprints
Types of Fingerprints
Compare your fingerprints to these three types to see what kind you have!
Lesson 3Accessory structures
Do Now
Hand in Anatomy in the News!
Pluck a strand of hair from your own head.
Describe the following:Color
Texture
Density
Flexibility
Strength
HairAccessory structure
Epithelial tissue
Fine and downy except on head
Found on all body parts except: palms, soles, lips, nipples, external reproductive organs
Structure of hair
Oil gland
Sebaceous glands
Smooth muscleErrector pilli allows hair to stand on end
Hair Follicles
Located in the dermis
Divide rapidly producing new hair cells
As hair is pushed away less nutrients are received
Root = within the follicle
Shaft = beyond the skin
Nails
Accessory structure
Epithelial tissue
Nail root: divides to push out new nail
Cuticle: large amount of cell division
Vascularized creates pink color of unpainted nails
Hair & Nails
Content Check
Which part of the hair contains actively growing cells?
a) base of hair follicle
b) hair root
c) hair shaft
In class assignment
Skin coloring worksheet
Homework
Text pg. 96 “Study Questions” #5
Lesson 4Hair
In class assignment
Analyze hair samples
Lesson 5Glands and Homeostasis
Do Now
What do glands do?
GlandsFunctions
Specialized groups of cells that produce and secrete substances into ducts
Types
Sweat glands
Sebaceous glands
Mammary glands
Sweat Glands
Present in all regions of the skin
Most glands are found in the palms and soles
Why?
Become active when under stressWhat is stress? What causes stress?
Use exocytosis to release sweatWhat is exocytosis?
Apocrine Glands
Type of sweat gland
Open onto hair follicles
Found in armpits, groin, anus
Become active at puberty
Act as an attractant to the opposite sex
Eccrine Glands
Type of sweat gland
Open to the surface of the skin
Become active when hot
Lower body temperature
EXCRETE salts, urea, waterWhat is excretion?
Sebaceous Glands
Associated with hair follicles
Lubricates skin and hair
Makes skin waterproof
Kills bacteria
Secrete oils called sebum
If you don’t release sebum the glands become inflammed and cause acne
How can this be prevented or treated?
Mammary Glands
Similar to apocrine glands
Found in the female breast
Produce milk at childbirth
Can continue to produce milk as long as a child is nursing
AgingCell division (mitosis) decreases
Demis becomes thinner
Adipose in hypodermis decreasesWhat effect might this have on the elderly?
Fewer blood vessels
Hair follicles decrease
Melanocytes decreaseGrey hairPale skin
UV radiation causes wrinkles , benign skin growths and skin cancer
The Integument and homeostasis
Protection
Regulate water loss
Excretion
Vitamin D
Sensory organ
Body temperature regulation
Content Check
Which glands begin secretion at puberty and contain a sex attractant? _________________
Which of the following pathologies causes women to develop excessive body and facial hair?
a) alopecia
b) hirsutism
c) acne vulgaris
Apocrine glands
Homework
Text pg. 96 “Study Questions” # 6 - 11
Lesson 7Review
Do Now
Read pg 88-89, section on Skin CancerWhat is skin Cancer?
Can anyone get skin cancer?
Name and describe the different types of skin cancer.
Do Now
Text pg. 96 “Learning Objectives” # 1-11
Homework
Text pg. 96 “Learning Objectives” # 6 - 11