Integumentary system
The integumentary System Made up of: 1. 2. 3. Function: _____________ the body Skin Hair Nails Covers and protects
Layers of Skin 1. Epidermis 2. Dermis Humans have __________ 6 or 7 layers
Epidermis keratinized Made up of flat __________ cells Composed of mostly ________ cells which eventually fall off waterproofs skin dead
Melanin Found in the __________ Provides: 1. 2. Amount produced is dependent on: Epidermis UV protection Skin Color Amount of sunlight exposure Genetics
Who produces more melanin?
Which person has a greater chance of getting skin cancer? Why?
Table Talk Which person has a greater chance of getting skin cancer? Why?
Tattoos and Tanning Tanned _________ cells fall off epidermal Are permanent, so ink is injected into the ____________ epidermal dermis
Albinism Is the _________ for an organism to produce ____________ inability melanin genetic
Is this an example of Albinism? Why or why not?
Is this an example of Albinism? If an animal’s eyes are any color other than pinkish-red or pale blue, it’s NOT albino.
Dermis Second _______ layer of skin Composed of: 1. _______ cells 2. ___________ structures Second Living Specialized
Specialized Structures within the Dermis
Specialized Structures within the Dermis Blood Vessels Carry oxygen and other nutrients Arrector Pili Muscle Moves the hair Sweat Gland Produces and releases water, salts and urea Sebaceous (Oil) Gland Produces and releases sebum Sensory Receptor Responds to environmental stimuli Hair Follicle Provides nutrients which allow the hair to grow Melanocyte Produces melanin
Sebum Prevents ______ loss and softens ________ Released by the __________ water skin Sebaceous gland
Structure of Hair Made up of dead _________ cells keratinized Cuticle Shaft is composed of: Cuticle Cortex Medulla keratinized 25
The Cuticle Human Hair Scale pattern is different between species Deer Hair 26
The Cortex Contains melanin Gives hair its color 27
The Medulla Shape is different between species Is wider in animals
Determining Species Determine species by using: ___________ Scale pattern Shape Cuticle Medulla 29
Identify the Species Cat Hair Human Hair Deer Hair
Cattle Hair Cat Hair Human Hair Dog Hair 31
Identify the Species Human Hair Human Hair
Examination of Hair Hair can’t be ____________ to one person connected Follicular Tag only source of __________ connected DNA 33
Hair as Evidence Origin Forcefully removed
Hair Samples You must also draw: Human Hair Cat Hair Dog Hair Horse Hair Make sure to label: The cuticle The cortex The medulla Reference page 360 in the forensics book Guinea Pig Hair You must also draw: Human Hair Cat Hair Dog Hair
Hair Samples Cat Hair Dog Hair Human Hair Make sure to label: The cuticle The cortex The medulla Reference page 360 in the forensics book Dog Hair Human Hair