Pathology L 6
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Questions and Answers

What is cell injury?

  • A condition where cells function normally.
  • Disruption of cell homeostasis or steady state. (correct)
  • A process of programmed cell death.
  • An increase in cell size and function due to adaptation.

Cell injuries occur only inside the cell

False (B)

List the three responses of a cell to injury.

Adaption, degeneration and death of cell

Cell injury can be reversible or irreversible. Irreversible cell injury is the progression from degeneration to death

<p>True (A)</p> Signup and view all the answers

What are the six mechanisms of cell injury, as discussed in class?

<p>Depletion of ATP, mitochondrial damage, Calcium influx and loss of calcium homeostasis, oxidative stress, defects in membrane permeability and damage to DNA and proteins</p> Signup and view all the answers

What determines the morphology of cell injury?

<p>The cause, extent, duration, and type of cell affected. (B)</p> Signup and view all the answers

What are the three most common causes of cell injury?

<p>Oxygen deficiency, infectious agents common/important, and immunological dysfunction</p> Signup and view all the answers

Which of the following is not a cause of cell injury?

<p>None of the above (D)</p> Signup and view all the answers

What is hypoxia?

<p>Partial reduction in oxygen delivery to a tissue. (B)</p> Signup and view all the answers

What is anoxia?

<p>No oxygen delivery to a tissue</p> Signup and view all the answers

What are the four causes (discussed in class) of hypoxia/anoxia?

<p>Inadequate oxygenation of blood, reduced transport of oxygen in blood, reduction in blood supply (ischemia), and blockage of cell respiratory enzymes</p> Signup and view all the answers

Match the cause of hypoxia/anoxia with its description or example

<p>Inadequate oxygenation of blood = Heart failure;respiratory failure Reduced transport of oxygen in blood = Anemia, carbon monoxide toxicosis Reduction in blood supply = Thrombosis Blockage of cell respiratory enzymes = Cyanide toxicosis</p> Signup and view all the answers

What are the five infectious agents as discussed in class?

<p>Viruses, bacteria, fungal (mycosis), protozoan and metazoan parasites</p> Signup and view all the answers

Match the type of infectious agent with its defining characteristic or example:

<p>Viruses = Obligate intracellular parasites Bacteria = Produce toxins ; overwhelming and uncontrolled replication Fungi = Progressive, chronic inflammatory disease Protozoan = Replicate in specific host cells, causing cell destruction</p> Signup and view all the answers

Immune system failing to respond may result from _____ (e.g. SCIDS in Arabian foals) or _____ (e.g.)) damage to lymphoid tissue due to viral infections, chemicals or drugs)

<p>Congenital defects; acquired defects</p> Signup and view all the answers

Immune system over-responding or aberrant reaction can lead to ____ (e.g. FAD, feline asthma) or ____ (e.g. systemic lupus erythematosus).

<p>Hypersensitivity reactions; autoimmune diseases</p> Signup and view all the answers

Work load imbalance often leads to _______

<p>Cell adaption</p> Signup and view all the answers

How do cells typically adapt to an increased workload?

<p>Hyperplasia and Hypertrophy (B)</p> Signup and view all the answers

What cellular adaption occurs due to a decreased workload?

<p>Atrophy and some forms of oncosis (D)</p> Signup and view all the answers

What are the two metabolic pathways in which ATP is produced?

<p>Aerobic (Krebs cycle) and Anaerobic (glycolysis)</p> Signup and view all the answers

At what percentage of ATP depletion does significant cellular injury occur?

<p>5-10% (B)</p> Signup and view all the answers

How does ATP depletion affect cellular metabolism?

<p>Shifts metabolism to anaerobic glycolysis, leading to increased lactic acid and decreased pH (A)</p> Signup and view all the answers

Which of the following structures is directly affected by ATP depletion, ultimately leading to cell necrosis?

<p>Mitochondria and lysosomes (A)</p> Signup and view all the answers

Which of the following is NOT one of the three major consequences of mitochondrial injury?

<p>Increased ATP production (D)</p> Signup and view all the answers

What is the consequence of opening the mitochondrial permeability transition pore (MPTP)?

<p>Loss of membrane potential and failure of oxidative phosphorylation, leading to progressive depletion of ATP (B)</p> Signup and view all the answers

How does mitochondrial damage contribute to reactive oxygen species (ROS)?

<p>By impairing electron transport, leading to leakage of electrons and ROS formation (B)</p> Signup and view all the answers

How does mitochondrial injury trigger apoptosis?

<p>It leads to the release of apoptosis-activating proteins into the cytosol (C)</p> Signup and view all the answers

Which of the following is NOT a source of intracellular calcium accumulation?

<p>Decreased sodium influx into the cell (D)</p> Signup and view all the answers

What two intracellular organelles are responsible for releasing stored calcium?

<p>mitochondria and the smooth endoplasmic reticulum</p> Signup and view all the answers

The opening of the mitochondrial permeability transition pore (MPTP) leads to ATP depletion, which in turn results in the activation of which enzyme types that contribute to cell injury?

<p>Phospholipases, proteases, endonucleases, and ATPases (B)</p> Signup and view all the answers

Match the enzymes to its contribution to cellular damage

<p>Phospholipases = Degrade membrane phospholipids Endonucleases = Lead to DNA and chromatin fragmentation ATPases = Accelerate ATP breakdown Proteases = Damage the membrane and cytoskeletal proteins</p> Signup and view all the answers

Which of the following is NOT one of the three major forms of damage caused by calcium accumulation?

<p>Increased glycogen synthesis (B)</p> Signup and view all the answers

When are ROS normally produced in the body?

<p>As byproducts of oxidative phosphorylation in mitochondria</p> Signup and view all the answers

What makes ROS highly reactive and damaging to cells?

<p>They are molecules or atoms with unpaired electrons, making them free radicals (B)</p> Signup and view all the answers

Which of the following is a correct sequence of partially reduced oxygen intermediates produced in normal metabolic reactions?

<p>Superoxide anion (O₂⁻) → Hydrogen peroxide (H₂O₂) → Hydroxyl ion (•OH) (A)</p> Signup and view all the answers

Which of the following is NOT a major pathological source of ROS?

<p>Glycogen storage in the liver (D)</p> Signup and view all the answers

Howl does inflammation contribute to the formation of ROS?

<p>Activated by WBC (especially neutrophils) generate ROS during phagocytosis (A)</p> Signup and view all the answers

Why do transition metals like iron and copper contribute to ROS formation?

<p>They donate or accept free electrons, catalyzing free radical formation (A)</p> Signup and view all the answers

How does nitric oxide (NO) contribute to reactive oxygen species production?

<p>NO can act as a free radical and form peroxynitrate (ONOO-), a damaging ROS (B)</p> Signup and view all the answers

How does radiant energy contribute to ROS?

<p>Radiation causes the dissociation of water, leading to hydroxyl ion formation (A)</p> Signup and view all the answers

Which of the following correctly lists the four primary mechanisms by which free radicals are removed from cells?

<p>Spontaneous decay, enzymatic breakdown, storage and transport proteins, antioxidants (D)</p> Signup and view all the answers

Which of the following describes the spontaneous decay of reactive oxygen species (ROS)?

<p>Superoxide (O₂⁻) reacts with water to form hydrogen peroxide (H₂O₂) (C)</p> Signup and view all the answers

What enzymes are responsible for removing free radicals and neutralizing ROS?

<p>Catalase, superoxide dismutase, glutathione, peroxidase</p> Signup and view all the answers

Which proteins help bind and neutralize reactive metals that contribute to ROS?

<p>Transferrin, ferritin and ceruloplasmin</p> Signup and view all the answers

What are the key antioxidants that neutralize ROS?

<p>Vitamin A, E, and glutathione</p> Signup and view all the answers

How does reactive oxygen species (ROS) cause lipid peroxidation in membranes?

<p>By generating peroxides that trigger an autocatalytic chain reaction, leading to extensive membrane damage (A)</p> Signup and view all the answers

The “three consequences of membrane damage” are ?

<p>Mitochondrial, plasma membrane, and lysosomal membranes</p> Signup and view all the answers

When both proteins and DNA are damaged/overwhelmed, what does this initiate?

<p>Initiates apoptosis</p> Signup and view all the answers

Flashcards

Cell Injury

Changes in a cell's normal state caused by a disruption to its stability.

Cell injury happens only inside the cell

False. Cell injury can also happen due to external factors like toxins or lack of oxygen.

Cell injury responses

A cell's responses to injury include adapting to the stress, deteriorating, or dying.

Irreversible cell injury

True. Irreversible injury happens when cells cannot recover and eventually die.

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