cell alteration /injury Flashcards
what can a cell do in response to injury?
- adapt
- be damaged
- die
what kind of change is cell swelling?
hyrdopic change
what happens when there is endogenous accumulation (like lipidosis)
- metabolic pathways in cells are inhibited by injury or overwhelmed by excess demand
- triglyceride accumulation is one common manifestation of metabolic change
what happens when there is endogenous accumulation (like glycogenosis)
-glycogen accumulates die to abnormal metabolism
what happens when there is endogenous accumulation (like hemosiderin)
- intracellular aggregates of ferritin (an iron-protein conjugate)
- commonly associated with: increased RBC senescence and hemolysis
what happens when there is endogenous accumulation (like lipfuscin)
- undegradable remnants of oxidized membrane lipids
- it can accumulate as a part of aging or due to excessive membrane oxidation
what is neoplastic transformation
transformed cells may have abnormal growth, often abnormal function, and abnormal morphology
what is coagulative necrosis?
-cell and tissue death due to loss of energy
what is the basic morphology coagulative necrosis
cells are retained but have a “ghost-like’ appeanace
- pale and dry
- frequently surrounded by a zone of inflammation
what are some causes of coagulative necrosis
- loss of energy
- oxygen metabolites
- toxins
histologic appearance of coagulative necrosis
- cell outlines are retained
- nuclei are shrunken (pyknotic), fragmented (karyorrhaxis), absent (karyolysis)
what is liquefactive necrosis
-cell and tissue death associated with liquefaction in response to neutrophil enzymes
what is the basic tissue morphology of liquefactive necrosis
- tissue is replaced by liquified debris (pus)
- focal pus accumulation (abscess)
what are the causes of liquefactive necrosis
- pyogenic bacterial infection
- hypoxia in the nervous system
what is the histology of liquefactive necrosis
- neutrophils
- liquefaction of the tissues in response to neutrophil enzymes
- outer fibrous capsule in mature lesions