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1. General Reaction General reaction patterns are common ways in which tissues and organs respond
Patterns to injury or disease, such as inflammation, degeneration, necrosis, and repair.
These patterns help pathologists understand the underlying processes of various
diseases.
2. Acute Inflamma- Acute inflammation is the immediate and early response of tissue to injury or
tion infection, characterized by redness, heat, swelling, pain, and loss of function.
3. Diapedesis Diapedesis is the process by which white blood cells move out of the bloodstream
through the walls of blood vessels to reach the area of tissue injury or infection.
4. Neutrophils Neutrophils are a type of white blood cell that are among the first immune cells to
arrive at the site of acute inflammation. They help defend the body by ingesting
and destroying bacteria and other foreign substances.
5. Chemotaxis Chemotaxis is the directed movement of immune cells toward higher concentra-
tions of certain chemical signals at the site of inflammation. It helps the immune
system focus its response where it is most needed.
6. Apoptosis and Apoptosis is a programmed, orderly process of cell death that helps maintain
Necrosis healthy tissue function. Necrosis, in contrast, is uncontrolled cell death due to
injury, leading to cell lysis and inflammation surrounding the site.
7. Morphological Morphological differences refer to the distinct changes in cell structure and
Differences appearance that help distinguish between types of cell death, like the shrinking
and fragmentation of cells in apoptosis versus the swelling and rupture of cells in
necrosis.
8. Nuclear Frag- Nuclear fragmentation is a morphological feature of apoptosis where the cell's
mentation nucleus breaks into smaller, membrane-bound pieces called apoptotic bodies.
9. Programmed
Cell Death
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Programmed cell death is a controlled process by which cells intentionally die as
part of normal growth, development, or maintenance of healthy tissues. Apoptosis
is a common type of programmed cell death.
10. Caspases Caspases are a family of enzymes that play a central role in the process of apop-
tosis. Once activated by signals from either the mitochondrial or death receptor
pathways, caspases break down proteins in the cell, leading to controlled cell
death.
11. Mitochondrial The mitochondrial pathway is a type of programmed cell death where signals
Pathway inside the cell trigger the mitochondria to release proteins that activate enzymes
called caspases, ultimately leading to cell death. This pathway is also known as
the intrinsic pathway of apoptosis.
12. Chronic Inflam- Chronic inflammation is prolonged inflammation where the body continues re-
mation acting to persistent harmful stimuli, resulting in tissue destruction and repair
occurring at the same time.
13. Granulomatous A granulomatous reaction is a specific type of chronic inflammation where the
Reaction immune system forms small clusters of macrophages, often surrounded by lym-
phocytes. These clusters, called granulomas, form in response to substances that
are difficult to eliminate, such as certain infections or foreign bodies.
14. Giant Cells Giant cells are large cells formed by the fusion of several macrophages. They have
multiple nuclei and are commonly seen in granulomatous inflammation, aiding
in containing agents that are hard for the body to eliminate.
15. Hypertrophy Hypertrophy is the increase in the size of cells, leading to enlargement of a tissue
or organ, typically as a response to increased demand or stimulation.
16. Increased Cell Increased cell size refers to the enlargement of individual cells, often as a response
Size to greater functional demand or stimulation. This is a key feature of hypertrophy,
where cells grow bigger but do not increase in number.
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17. Heart and Blood Heart and blood vessel disorders include conditions that affect the structure or
Vessel Disorders function of the heart and blood vessels, such as coronary artery disease, heart
failure, and hypertension. These conditions can impair blood circulation and lead
to serious complications.
18. Atherosclerosis Atherosclerosis is a condition where fatty deposits, cholesterol, and other sub-
stances build up on the inner walls of arteries, leading to narrowing and reduced
blood flow.
19. Atheromatous Atheromatous plaque structure describes the build-up within the artery wall that
Plaque Structure consists of a lipid-rich core, inflammatory cells, and a fibrous cap. This structure
narrows the vessel and can restrict blood flow.
20. Smooth Muscle Smooth muscle proliferation refers to the increase in the number of smooth
Proliferation muscle cells in the blood vessel wall. In atherosclerosis, these cells migrate from
the media to the intima layer and contribute to plaque growth and fibrous cap
formation.
21. Clinical Conse- Clinical consequences are the health effects that result from atherosclerosis, such
quences as heart attacks, strokes, and peripheral artery disease. These occur when blood
flow is significantly reduced or blocked due to plaque buildup or rupture.
22. Myocardial In- Myocardial infarction, also known as a heart attack, occurs when blood flow to
farction part of the heart muscle is blocked, usually due to a clot in a narrowed artery. This
leads to tissue death in the affected part of the heart.
23. Common Sites of Common sites of involvement are the arteries most frequently affected by athero-
Involvement sclerosis. These include the coronary arteries (heart), carotid arteries (neck), and
arteries of the legs and brain.
24. Coronary Arter- Coronary arteries are the blood vessels that provide oxygen-rich blood to the heart
ies muscle. They are often affected by atherosclerosis, which can lead to heart attacks.
25.
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