Page 1 of 70
HCR 240 FINAL ACTUAL EXAM STUDY
GUIDE 2026 ALL QUESTIONS AND
CORRECT DETAILED ANSWERS ALREADY
A GRADED WITH EXPERT FEEDBACK
|NEW AND REVISED
What is the fundamental definition of hypoxic injury? - ANSWER-
Hypoxic injury occurs when a cell does not receive sufficient oxygen to
maintain its normal functions.
Why is oxygen critical for cellular survival? - ANSWER- Oxygen is
required to produce ATP, which serves as the primary energy source for
the cell's metabolic processes, including the operation of ion pumps.
What is the sequence of events leading from low oxygen to cell death? -
ANSWER- Low oxygen leads to low ATP, which causes the sodium-
potassium pump to fail. Sodium accumulates inside the cell, drawing
water in via osmosis, resulting in cell swelling, dysfunction, and
eventually cell death if the condition persists.
What are common clinical causes of hypoxic injury? - ANSWER-
Common causes include heart attack, stroke, anemia, shock, respiratory
failure, and carbon monoxide poisoning.
,Page 2 of 70
Which organs are most susceptible to hypoxic injury and why? -
ANSWER- The brain, heart, and kidneys are most susceptible because
they have high metabolic demands and require a constant, significant
supply of oxygen.
Free radicals - ANSWER- Unstable molecules that damage cell
membranes, proteins, and DNA.
Causes of free radicals - ANSWER- Radiation, inflammation, toxic
chemicals, reperfusion injury, aging, smoking.
Reperfusion injury - ANSWER- After blood flow returns to an injured
area, oxygen can suddenly create free radicals.
What do free radicals damage? - ANSWER- Cell membranes, proteins,
and DNA.
What is the result of oxygen returning to an injured area? - ANSWER-
Reperfusion injury.
Chemical Injury - ANSWER- Toxins, drugs, alcohol, poisons, and
pollutants can directly damage cells.
Examples of chemical injury - ANSWER- Alcohol damages liver cells.
Carbon monoxide blocks oxygen delivery. Some medications can
damage kidneys or liver if toxic.
,Page 3 of 70
Infectious Injury - ANSWER- Bacteria, viruses, fungi, and parasites can
damage cells directly or trigger inflammation that damages tissue.
Immunologic Injury - ANSWER- The immune system can harm the
body when it attacks self-tissue or overreacts.
Examples of immunologic injury - ANSWER- Autoimmune disease,
allergies, transplant rejection.
Nutritional Injury - ANSWER- Too little or too much nutrition can
injure cells.
Examples of nutritional injury - ANSWER- Protein deficiency, vitamin
deficiency, obesity, high cholesterol.
Genetic Injury - ANSWER- Inherited defects can cause abnormal
proteins, enzyme problems, or abnormal cell development.
Examples of genetic injury - ANSWER- Sickle cell anemia, cystic
fibrosis, Down syndrome.
Necrosis - ANSWER- Uncontrolled cell death that usually causes
inflammation.
, Page 4 of 70
Coagulative Necrosis - ANSWER- Cells die, but the tissue structure
stays somewhat intact for a while.
Cause of Coagulative Necrosis - ANSWER- Usually caused by
ischemia, meaning lack of blood flow.
Organs commonly affected by Coagulative Necrosis - ANSWER- Heart,
kidneys, spleen.
Liquefactive Necrosis - ANSWER- Dead tissue becomes liquid-like.
Common locations for Liquefactive Necrosis - ANSWER- Brain tissue
and abscesses.
Caseous Necrosis - ANSWER- Cheese-like appearance.
Condition commonly associated with Caseous Necrosis - ANSWER-
Tuberculosis.
Fat Necrosis - ANSWER- Fat tissue is destroyed, often by enzymes.
Common causes of Fat Necrosis - ANSWER- Pancreatitis or breast
trauma.
HCR 240 FINAL ACTUAL EXAM STUDY
GUIDE 2026 ALL QUESTIONS AND
CORRECT DETAILED ANSWERS ALREADY
A GRADED WITH EXPERT FEEDBACK
|NEW AND REVISED
What is the fundamental definition of hypoxic injury? - ANSWER-
Hypoxic injury occurs when a cell does not receive sufficient oxygen to
maintain its normal functions.
Why is oxygen critical for cellular survival? - ANSWER- Oxygen is
required to produce ATP, which serves as the primary energy source for
the cell's metabolic processes, including the operation of ion pumps.
What is the sequence of events leading from low oxygen to cell death? -
ANSWER- Low oxygen leads to low ATP, which causes the sodium-
potassium pump to fail. Sodium accumulates inside the cell, drawing
water in via osmosis, resulting in cell swelling, dysfunction, and
eventually cell death if the condition persists.
What are common clinical causes of hypoxic injury? - ANSWER-
Common causes include heart attack, stroke, anemia, shock, respiratory
failure, and carbon monoxide poisoning.
,Page 2 of 70
Which organs are most susceptible to hypoxic injury and why? -
ANSWER- The brain, heart, and kidneys are most susceptible because
they have high metabolic demands and require a constant, significant
supply of oxygen.
Free radicals - ANSWER- Unstable molecules that damage cell
membranes, proteins, and DNA.
Causes of free radicals - ANSWER- Radiation, inflammation, toxic
chemicals, reperfusion injury, aging, smoking.
Reperfusion injury - ANSWER- After blood flow returns to an injured
area, oxygen can suddenly create free radicals.
What do free radicals damage? - ANSWER- Cell membranes, proteins,
and DNA.
What is the result of oxygen returning to an injured area? - ANSWER-
Reperfusion injury.
Chemical Injury - ANSWER- Toxins, drugs, alcohol, poisons, and
pollutants can directly damage cells.
Examples of chemical injury - ANSWER- Alcohol damages liver cells.
Carbon monoxide blocks oxygen delivery. Some medications can
damage kidneys or liver if toxic.
,Page 3 of 70
Infectious Injury - ANSWER- Bacteria, viruses, fungi, and parasites can
damage cells directly or trigger inflammation that damages tissue.
Immunologic Injury - ANSWER- The immune system can harm the
body when it attacks self-tissue or overreacts.
Examples of immunologic injury - ANSWER- Autoimmune disease,
allergies, transplant rejection.
Nutritional Injury - ANSWER- Too little or too much nutrition can
injure cells.
Examples of nutritional injury - ANSWER- Protein deficiency, vitamin
deficiency, obesity, high cholesterol.
Genetic Injury - ANSWER- Inherited defects can cause abnormal
proteins, enzyme problems, or abnormal cell development.
Examples of genetic injury - ANSWER- Sickle cell anemia, cystic
fibrosis, Down syndrome.
Necrosis - ANSWER- Uncontrolled cell death that usually causes
inflammation.
, Page 4 of 70
Coagulative Necrosis - ANSWER- Cells die, but the tissue structure
stays somewhat intact for a while.
Cause of Coagulative Necrosis - ANSWER- Usually caused by
ischemia, meaning lack of blood flow.
Organs commonly affected by Coagulative Necrosis - ANSWER- Heart,
kidneys, spleen.
Liquefactive Necrosis - ANSWER- Dead tissue becomes liquid-like.
Common locations for Liquefactive Necrosis - ANSWER- Brain tissue
and abscesses.
Caseous Necrosis - ANSWER- Cheese-like appearance.
Condition commonly associated with Caseous Necrosis - ANSWER-
Tuberculosis.
Fat Necrosis - ANSWER- Fat tissue is destroyed, often by enzymes.
Common causes of Fat Necrosis - ANSWER- Pancreatitis or breast
trauma.
