2- Cell Injury Flashcards
the 3 causes of cell injury
deficiency - intoxication - trauma
Def: Lack of substance(s) necessary to the cell
Deficiency
Type of deficiency: - lack of a specific component/nutrient in food/diet
Primary Nutrient Deficiency
Examples of Primary Nutrient Deficiency
B3 niacin - Vit C - B1 thiamin
deficiency in that leads to pellagra, inflammation of skin, Cosal’s necklace, facial lesions, dementia (corn/molasses + alcohol diet)
B3-niacin Defic - “primary”
Vitamin C deficiency leads to
scurvy
B1 (thiamin) deficiency leads to
beriberi
Type of def where component/nutrient in food/diet, but cannot be absorbed
Secondary Nutrient Deficiency
Vitamin B12 deficiency resulting in
pernicious anemia
B12 must be combined with _____ to be carried into the blood
intrinsic factor
B12 function
needed for normal RBC production in bone marrow and normal nerve cell metabolism
Def: poisoning, toxins, or substance interfering with cell function
Intoxication
Type of intoxication: gets into the body from outside environment
Exogenous toxins
examples of Exogenous toxins
Microbes/infections
Chemicals
Overdose
Type of intoxication: produced inside the body
Endogenous toxins
Types of Endogenous toxins
Genetics
Ionizing Radiation
Accumulation of metabolic byproducts
2 types of genetic endogenous toxins
Accumulation of a normal metabolite
Activation of an alternate pathway
Normally, phenylalanine is converted to
Tryosine
However, if oxidase is not produced, _____ is not converted
homogentisic acid (an intermediate), aka alkapton
Homogentisic acid accumulates and is excreted in ____
Urin (looks black)
Homogentisic acid Can also accumulate in specific tissues leading to ____
Onchronosis
common site of accumulation of alkapton leading to OA and severe degeneration
Cartilage
Alkapton can cause ______ of IVD
Calcification
Alkapton deposited in ears leading to
ears appear blue
Homogentisic acid (alkapton) is an example of
Accumulation of a normal metabolite
Nonproduction of the enzyme hydroxylase results in a
switch to an alternate pathway
switching to an alternate pathway leads to production of
(Phenylketonuria)
phenylpyruvic acid
phenyllactic acid
phenylacetic acid
Phenylketonuria leads to
serious mental underdevelopment
low IQ
many can’t walk or talk
Phenylketonuria treatment
don’t eat phenylalanine
Phenylketonuria is an example of
Activation of an alternate pathway
Type of endogenous toxins:
Could result in the production free radicals that can destroy cell membranes
Ionizing Radiation