S3L3: Injuries and Healing

regeneration

repair of destroyed tissue with the same king of cells

(shallow)

fibrosis

replacement of destroyed tissues with dense connective tissue

forms a scar

(deep)

inflammation

the initial responce of the body to injury

limits the extent of injury and initiates repair and regen

redness symptom

vasodilation of blood vessels increases blood flow to the area

heat symptom

increase blood accumulation leands to increased metabolic activity

swelling symptom

inrease permeability of blood vessels allows fluid to enter tissues space

pain symptom

results from injury to neurons an increased pressure from edema

burn

tissues damage and cell death cauased heat, electricity, uv radiation, or chemicals

first degree burn

only epidermis is damaged

skin is red and swollen

second degree burn

epidermis and upper dermis are damaged

skin is red and blistering

third degree burn

destroys entire skin layer, including hypodermis

blood vessels and nerve endings are destroyed

burn is grey/black

skin grafting is neccessery

critical burn

over 25% of the body has second degree burns

over 10% of the body has third degree burns

third degree burns on face, hands, and feet

rules of nines

way to estimate the extent of burns

body is divided into 11 areas for quick estimate

most common types of cancer

Benign & malignant

basal cell carcinoma

least malignant

most common

arisis from cells in stratum basale

squamous cell carcinoma

may metastasize to lymph nodes

early removal allows a good chance of cure

malignant melanoma

most deadly

cancer of melanocytes

metastasizes rapidly to lymph and blood vessles

ABDCE rule for melanoma

Asymmetry - two sides do not match

Border irregularity- borders are not smooth

Color - different colors

Diameter - Larger than 6mm

Evolving - changes size, shape, color, etc