Class 2 Flashcards
Apoptosis
programmed cell death
Necrosis
exogenously induced cell death
Most common necrosis
Coagulative
Coagulative necrosis occurs when
cell proteins altered
Ex. of coagulative necrosis
Heart attack
Coagulative necrosis typically occurs in
solid internal organs
What occurs during Liquefactive necrosis
Dead cells liquify
What happens to tissues from liquefactive necrosis
Become soft
Where liquefactive necrosis occurs most?
Brain
Where caseous necrosis typically found
In tuberculosis
What happens to tissue from caseous necrosis
Become cheesy and yellow
What Fat necrosis causes
Form of liquefactive necrosis limited to fat tissue
Gangrene
dead tissue
lysis means
Dissolution of cell
What form of cell death is Apoptosis
Active form, highly regulated
Inflammation is
Response to tissue injury
Pathogenesis of inflammation involves how many steps
4
Pathogenesis of inflammation step 1:
Changes in circulation of blood
Pathogenesis of inflammation step 2
Changes in vessel wall permeability
Pathogenesis of inflammation step 3
Release of soluable mediators of inflammation
Pathogenesis of inflammation step 4
Cellular events – leukocyte emigration/Phagocytosis
Histamine released from
Platelets and mast cells
Histamine increases?
Blood vessel permeability
Bradykinin is what?
Plasma protein
Bradykinin does what?
similar to histamine/slower/incites pain
Complement System is
Group of plasma proteins from liver/ inactive
Activation of complement system leads to
Biologically active fragments, intermediate complexes, membrane attack complex
Opsonization
Phagocytosis of bacteria
Anaphalaxis
histamine release w/ increased permeability
Chemotaxis
Migration of leukocytes
Cell lysis happens through
MAC
Arachidonic Acid (AA) Derivatives derived from
Phospholipids of cell membranes
AA metabolized through
Lipoxygenase pathway
Cyclooxygenase pathway
Leukotrienes
Promote chemotaxis
Lipoxins
Inhibit chemotaxis
Prostaglandins
Cause vasodilation
Prostacyclin
counters thromboxane
Thromboxane
Platelet aggregation
Emigration of leukocytes increases? how long?
Permeability of vessel wall/ up to several hours
As scavengers, PMNs do what?
Uptake cellular debris/bacteria
Phagocytosis causes PMNs to
Lose mobility, act as scavengers
Neutrophils (PMN) are the
Most numerous circulating WBCs
Eosinophils are prominent in
Allergic reactions
Basophils are prominent in
Allergic reactions mediated by IgE
Macrophages appear after how long?
3-4 days after onset
Macrophages are
Phagocytic and bactericidal
Platelets
fragments of cytoplasm from megakaryocytes
Transudate
Fluid that passes through membrane
Exudate
Fluid released from body
Chemotaxis moves WBC’s…
Up and along concentration gradient