Cell Injury and cell death Flashcards
What happens in coagulative necrosis?
Which organs does it affect?
Proteins in the cell breaks down when the cellular fluid becomes too acidified due to reduced blood flow. Tissue stay firm and holds their structures.
Can affect all tissues, except the brain.
Why does Liquefactive necrosis occurs?
What is the appearance of liquefactive necrosis?
Which organs does it affect?
Liquefactive necrosis occurs due to bacterial and fungal infections, when enzymes imbalances cause the cell to digest itself.
Dead tissues are softened and become liquid-like. Pus forms.
Can affect all tissues, including the brain.
Which 2 diseases can cause caseous necrosis?
TB and histoplasmosis.
Describe the appearance of tissues in caseous necrosis
Tissues are soft and cheese-like.
Cell structures are completely degraded by enzymes
Which type of necrosis have calcium deposits?
Describe how fat necrosis is known
Fat necrosis.
In fat necrosis, damaged cells release lipases which degrades fatty cells.
Which condition can have fat necrosis?
Acute pancreatitis
What causes fibrinoid necrosis?
Appearance of fibrinoid necrosis?
Immune complexes and fibrin deposited in the walls of vessels, leads to immune reaction.
Microscopically, thickened vessel walls with pinkish-red deposits that looks like fibrin deposits.
What does gangrenous necrosis first present as? After that, what will it progress into?
Gangrenous necrosis first presents as dry gangrene (coagulative necrosis).
Then proceeds into wet gangrene (liquefactive necrosis)
What are the two types of calcification? Which is associated with necrosis?
- Dystrophic calcification (associated with necrosis, necrotic or damaged tissues, normal serum calcium level)
- Metastatic calcification (associated with hypercalcaemia, Normal tissues, High serum calcium level)
What type of necrosis will commonly result from fungal or bacterial infections?
Liquefactive necrosis
Define pkynosis
Also known as Karyopyknosis, it is the irreversible condensation of chromatin in the nucleus of a cell undergoing apoptosis or necrosis.
What is often released from the mitochondria in the early stages of apoptosis?
Cytochrome C
What is the difference between hyperplasia and neoplasm?
Hyperplasia is the increase in number of cells under control of hormones and GF
Neoplasm is the increase in number of cells that persist after cessation of stimulus.
Is age related thymic atrophy a pathological or physiological atrophy?
Physiological atrophy
Is osteoporosis a pathological or physiological atrophy?
Pathological atrophy