Do you have a tattoo

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Do you have a tattoo?
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• Should public figures be allowed to have visible
  tattoos or should they be hidden?
• Are people judged based off of the tattoos they
  have?
• If you had a 16 year old child, would you allow
  them to get a tattoo?
• Are tattoos a form of self destructive behavior?
• Why do people get tattoos?

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Integumentary System
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What are the components of this system?

• Main Component Skin

• Accessories Hair, Nails and Glands

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What is the function of this system?

• Barrier protects against pathogens
• Prevents dehydration
• Storage unit for fatty tissue energy storage
• Produces Vitamin D helps build bone and teeth
• 1st line of sensory input pressure, temp, etc.
• Regulates body temperature

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What is the largest organ in your body?

• Skin is the largest organ in your body. It
  covers an area of 20.83 ft2 for an average adult.
  If removed from the body would weight about 20
  lbs.

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Are there different layers of skin?

• There are 3 different layers that make up the
  skin
• Epidermis
• Dermis
• Hypodermis

Epi upon or over Dermis true skin Hypo - below
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What is unique about the Epidermis?

• Outer layer that is visible to the naked eye is
  the epidermis.

• Avascular and contains no nerve endings.

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• Made up of 5 6 smaller layers.
• The outermost layer of the epidermis is comprised
  of dead cells stratum corneum.

• Dead cells are hard, flakey and filled with
  keratin.
• Shed about 500 million cells a day, 1 ½ lbs a
  year.

• Deepest layer (stratum basale) will replace dead
  cells.
• Takes about 2 4 weeks to completely replace the
  top layer of our skin.

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Why does skin come in different shades?

• In the deeper layers of the epidermis are
  specialized cells called melanocytes.
• Melanocytes produce melanin

• All humans contain the same amt. of melanocytes,
  but the amt. and distribution of melanin creates
  different skin tones and different eye colors.

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What is the role of melanin?

• Pigment that protects the skin from the UV rays
  of the sun.
• Helps absorb heat from the suns rays.
• Sharpens vision by minimizing the number of light
  beams entering the eye and focusing scattered
  light.

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What are freckles?
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What other pigments are found in skin?

• Carotene gives the body a yellow/orange hue.
• Hemoglobin found in blood an gives the body a
  reddish/pinkish hue.

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Is it possible to have no pigments?
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What can color tell us about disease?

• Yellow liver failure (jaundice)
• Bronze adrenal gland failure
• Black or Blue or Purple (Ecchynosis) skin,
  blood or circulatory failure
• Orange too much carotene in diet

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The second layer of skin is called the...
Dermis - True Skin
How is the true skin different from the epidermis

• Structure
• Capillaries (allows for blushing)
• Collagenous Elastic Fibers
• Involuntary Muscles
• Nerve Endings
• Lymph Vessels
• Hair Follicles
• Glands

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What role do glands play in the body?

• Sudoriferous Glands sweat glands help regulate
  temperature and excrete scents to attract sexual
  partners. (pheromones)
• 2 Types Apocrine and Eccrine Glands
• 3,000,000 sweat glands in the average human
• Sweat is composed of water, sodium, chloride,
  potassium, proteins and lipids
• Body odor sweat itself does not have an odor,
  but how the bacteria interact with the sweat is
  what gives you the odor

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Why could you skin also be considered part of the
immune system?

• Sebaceous Glands oil glands prevent skin from
  drying out and help destroy pathogens on the skin
  due to its acidic pH level.
• Oil is referred to as sebum
• Sebum in hydrophobic water repellent
• Sebum holds chemicals released by eccrine gland
• Glands become very active during puberty
• No glands on the palms and soles of feet

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3rd Skin Layer is called the Hypodermis or
Subcutaneous Fascia which means
Hypodermis below true skin or Subcutaneous
Fascia band of skin underneath.
Why is the hypodermis needed Contains
Connective Tissue (anchors skin to muscles)
lipocytes (padding, insulation and energy
storage).
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What if sebaceous glands get blocked or produce
to much?
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How Skin Heals
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Wound healing steps

• Wound fills with blood
• Portion of blood contains clotting factors that
  form blood clot (bodys natural band-aid)
• Top part of clot hardens when exposed to air and
  forms a scab
• White blood cells enter and destroy pathogens
• Fibroblasts (proteins) pull edges of the wound
  together
• Stratum basale layer hyperproduces new cells
• Scars forms usually lack accessory organs and
  nerve endings

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Wound healing