Integumentary System 111

Question 1

Healing occurs through

Answer 1

Regeneration: replaces injured tissue with the same kind of tissue
• Repair: fibrosis replaces injured tissue with scar tissue

Question 2

Healing occurs through

Answer 2

Regeneration: replaces injured tissue with the same kind of tissue
• Repair: fibrosis replaces injured tissue with scar tissue

Question 3

In skin, which tissue type undergoes regeneration, which undergoes fibrosis?

Answer 3

Epidermis-regeneration- cells undergo constant mitosis(labile cells) eg. Blood cells
Dermis- fibrosis- don’t have the ability to divide

Question 4

Regeneration

Answer 4

Depends on the regenerative capacity of the cell
- the epidermis has stem cells that are constantly dividing so it can repair the layer above it
- need to know everything on diagram

Question 5

True or False: scar tissue is as strong and flexible as healthy skin

Answer 5

False: Scar tissue can be weak as the healing process creates collagen bundles which don’t orientate themself for elasticity and flexibility

Question 6

Fibrosis

Answer 6

In non-regenerating tissues and in severe wounds, fibrosis(scar) tissues replace the lost ones

Question 7

The inflammatory phase

Answer 7

• the first phase
• there’s a lot of blood loss right away
• sometimes the bleeding is healthy to remove waste and toxins
• blood clotting stops the bleeding and prevents bacteria, toxins and other harmful substances from spreading

Question 8

The proliferative phase

Answer 8

• epidermis regenerates(epidereliaization)
• dermis forms new blood vessels(angio(blood vessels)genesis) and fibroblasts lay down new collagen bundles(fibrogensis)
• young scars look pink due to blood vessels within the new tissue

Question 9

The remodeling phase

Answer 9

The third phase
- overtime the fibroblast activities decrease and capillaries degenerate
- mature cells appears pink pale and contracts to pull wound margins together

Question 10

First degree burns

Answer 10

First degree(superficial): epidermis only, redness, slight edema and pain
Eg. Most sunburns and flash exposure which is a short but rapid interaction with chemical or radiation to the skin

Question 11

Second degree burns

Answer 11

• also known as partial thickness
• involves part of the dermis.
  • skin discolouration and scars are common
  E.g., scald or flash exposure , at a higher intensty

Question 12

Third degree burns

Answer 12

• also known as full thickness
• involves all of dermis and possible deeper tissues
  • white or charred in appearance

E.g., steam, hot oil, chemicals, electrical currents, flame, or infection

Question 13

What is a characteristic of a second degree burn

Answer 13

Blisters- they are the separation of the epidermis and dermis

Question 14

UV

Answer 14

Is a form of non-ionizing radiation

Question 15

UV-A

Answer 15

• consists of 95% of the uv spectrum that enters the atmosphere
• has indirect dna damage through the production of reactive oxygen species(ROS), ex tanning

Question 16

UV-B

Answer 16

• consists of 5% of UV radiation that enters the atmosphere
• exposure leads to direct dna damage(primidine diners)
• thymid if not corrected can lead to mutations

Question 17

UV-C

Answer 17

Is filtered out by the atmosphere

Question 18

Which UV wavelength from the sun stimulates vitamin D synthesis and which is the most directly carcinogenic?

Answer 18

UV-B