fundamentals - exam 1 Flashcards
Pathology
Study of diseases + their processes
Homeostasis
the “steady state” in which cells exists normally; equilibrium
Disease
An alteration in the homeostatic balance resulting in characteristic signs + symptoms
Etiology
study of causation of diseases
Pathogenesis
the mechanisms for the development of a disease
What is the purpose for understanding pathology?
classification of disease, diagnosis, treatment, prognosis, complications
What are the divisions of pathology?
immunology, hematology, histopathology, cytopathology, + genetics
immunology
study of the specific defense mechanisms of the body
hematology
study of blood related diseases
histopathology
study of disease by looking at changes in tissues
cytopathology
study of disease by looking at individual cell changes
genetics
study of abnormal chromosomes + genes
systemic pathology
division of path that studies specific diseases + their manifestations within different organ systems
what are the 4 categories of etiology?
damage, degeneration, diet, idiopathic
damage
physical, chemical, radiation
degeneration
wear and tear
idiopathic
unknown origin
Examples of morphological change in cells of an organ
detectable alterations in the shape of cells, tissues, + organs (ex: fatty liver)
Causes of cell injury (examples of each)
physical agents, chemical agents, infections, immunological, genetic defects, nutritional, hypoxia, + cellular aging
examples of cellular aging
damage to DNA from internal or external source
examples of hypoxia
oxygen deprivation
examples of physical agents
cuts + fracture
examples of genetic defects
cystic fibrosis + sickle cell
examples of nutritional agents
obesity + diabetes
examples of chemical agents
pollutants, alcohol, drugs
examples of infectious agents
bacteria, fungus, virus
examples of immunological agents
allergic rxn, autoimmune disorders
What are the reactions of the body to stress
cellular adaptations, reversible cell injury, irreversible cell injury, cell death
What can the cell do in response to a stress
Factors that affect the way the body responds to injury/stress
type of cell injured, severity of injury, nutrient availability, inflammatory response, regenerative capacity, intrinsic repair mechanism, type of injury, environmental factors
labile cells
a continuous renewal of the cell population
permanent cells
a static cell population. once damaged they arent replaced
stable cells
cell population that multiplies when necessary
Examples of labile cells
most cells, skin cells
Examples of permanent cells
neurons, myocardial cells, + skeletal muscle
Examples of stable cells
liver cells, kidney cells, + smooth muscle
What are the ways a cell adapts to stress?
hypertrophy, atrophy, hyperplasia, metaplasia, dysplasia
hypertrophy
increase in the size of the tissue bc of an increase in the size of cells (hypertension)
atrophy
Decrease in the size of the tissue bc of an decrease in the size of cells
hyperplasia
increase in the number of cells (benign prostatic hyperplasia)
metaplasia
change in the type of the cell (barrett’s esophagus)
dysplasia
disorderly growth of the cells (cervical dysplasia w/HPV infection)
substances that can accumulate in cells
iron, bilirubin, calcium, lipofuscin, amyloid, cholesterol, xanthelasma, xanthoma
what is an example of a local accumulation of iron?
bruise or hemochromatosis
what causes a systemic accumulation of iron?
blood transfusions
what is an example of a lipofuscin accumulation?
aging cells
what is an example of a bilirubin accumulation?
jaundice
what is an example of amyloid accumulation?
alzheimers disease + amyloidosis
what is an example of cholesterol accumulation?
xanthelasma, xanthoma, atherosclerosis
xanthelasma
plaques on eyelids
xanthoma
fat deposits under skin found under joints
dystrophic calcification
Calcium deposits in already damaged tissue
metastatic calcification
elevated serum calcium levels in normal tissue
how does hypercalcemia manifest?
kidney stones, bone fractures, peptic ulcers, depression
what is a free radical injury
unstable molecules that damage other cells, common in ECF
what are the types of free radicals
ROS (reactive oxygen species) + RNS (reactive nitrogen species)
what substance neutralizes ROS free radicals
superoxides, hydrogen peroxide, hydroxyl radical
what substances neutralize RNS free radicals?
nitric oxide
what is oxidative stress?
Imbalance of free radicals + antioxidants; caused by free radicals; plays role in aging process
reversible cell damage
cell + organelles swell, fat accumulation, nuclear chromatic clumping, recovery when stress is removed
irreversible cell damage
cell dies, necrosis, lysosomes rupture, autoysis
what changes occur to the cell nucleus during irreversible cell injury
pyknosis, karyorrhexis, karyolysis
pyknosis
Small dense nucleus
karyorrhexis
fragmentation of nucleus
karyolysis
Total disintegration of nucleus; enzymatic breakdown of dna AFTER cell death
necrosis
accidental cell damage
cause of coagulative cell necrosis
protein denaturation
example of coagulative cell necrosis
myocardial infarction
liquefactive cell necrosis
dead tissue that is transformed into a viscous fluid mass
example of liquefactive cell necrosis
stroke, abscesses
caseous cell necrosis
combination of coagulative + liquefactive; cheese like appearance
examples of caseous cell necrosis
Tuberculosis
gangrenous cell necrosis
caused by ischemia; 3 types
gas gangrene cell necrosis
production of gas accompanied by muscle necrosis
examples of gangrenous cell necrosis
diabetes mellitus (wet type), frostbite (dry type)
enzymatic cell necrosis
form of fat necrosis, caused by pancreatic enzymes
examples of enzymatic cell necrosis
pancreatitis
fat cell necrosis
occurs in damaged fatty tissue
example of fat cell necrosis
breast cancer, liver damage, acute pancreatitis
fibrinoid cell necrosis
aggregates of pink proteinaceous debris
examples of fibrinoid cell necrosis
Polyarteritis nodosa
apoptosis
programmed cell death with no inflammatory response
what regulates apoptosis
nitric oxide
what is required for apoptosis to occur
ATP
what are the 3 types/causes of apoptosis
embryogenesis, hormone dependence induction, cell delettion
examples of embryogenesis apoptosis
fingers + toes are webbed in utero, but apoptosis occurs so they are not out of utero
examples of hormone dependence induction apoptosis
death of endometrial tissue during a womans period
examples of cell deletion apoptosis
population of cells have normal turnover + die periodically (RBCs dying)
initiation stage of apoptosis
activation; cell receives signal to self destruct
intrinsic (mitochondrial) apoptosis pathway
caused by internal damage (ex: dna damage)
extrinsic (death receptor) apoptosis pathway
caused by external signals (ex: immune cells relapsing)
execution stage of apoptosis
destruction phase; cell shrinks, proteins + dna broken down; phagocytes remove. apoptotic bodies to prevent inflammation
examples of the nucleus being injured/affected
sickle cell disease (genetic), pernicious anemia (nutritional), skin/thyroid cancer + radiation/free radicals (toxic)
examples of diseases that affect the lysosome
gaucher’s disease + tay-sach’s disease
examples of diseases that affect the ribosome
ribosomopathies
examples of diseases that affect the endoplasmic reticulum
ALS, alzheimers, MS, parkinson’s
examples of diseases that affect the cell membrane
familial hypercholesterolemia + retrolental fibroplasia (receptor defects). clostridiuk perfringens (micro-organism damage)
examples of diseases that affect the mitochondria
hypoxia, ischemia, +anoxia
Example of hypertrophy
Hypertension
Example of atrophy
Poliomyelitis
Example of hyperplasia
Benign prostatic hyperplasia
Examples of metaplasia
Barret’s esophagus
Examples of dystrophic calcification
Atherosclerosis
Examples of metastatic calcification
Hypercalcemia, metastatic lytic bone disease, multiple myeloma
Examples of long-term effects of oxidative stress
Development of cancer, diabetes mellitus, + heart disease
Examples of oxygen based free radicals
Superoxide, hydrogen peroxide, hydroxyl radicals