Secondary injury to injured cells is caused by two main factors, which are?

Secondary injury to injured cells is caused by two main factors, which are?

• A. Hypoxia and decreased bloodflow
• B. Infection and dehydration
• C. Overheating and thrombosis
• D. Mechanical disruption and lysis

Answer: (A)

Secondary injury after tissue trauma is driven by insufficient oxygen delivery and reduced blood flow to the injured area. When circulation is compromised, cells lose the oxygen and nutrients they need to produce energy, so ATP drops. This causes failure of ion pumps, ionic imbalance, and cellular swelling. Calcium then accumulates inside cells and activates enzymes that damage membranes and cell structures, setting off a cascade that worsens cell death beyond the initial injury. These two factors—hypoxia (lack of oxygen) and decreased perfusion (reduced blood flow)—to a large extent determine how much damage occurs after the initial impact. Other factors like infection, dehydration, overheating, or direct mechanical disruption can worsen outcomes, but they don’t drive the immediate secondary injury cascade in the same fundamental way.

Secondary injury after tissue trauma is driven by insufficient oxygen delivery and reduced blood flow to the injured area. When circulation is compromised, cells lose the oxygen and nutrients they need to produce energy, so ATP drops. This causes failure of ion pumps, ionic imbalance, and cellular swelling. Calcium then accumulates inside cells and activates enzymes that damage membranes and cell structures, setting off a cascade that worsens cell death beyond the initial injury. These two factors—hypoxia (lack of oxygen) and decreased perfusion (reduced blood flow)—to a large extent determine how much damage occurs after the initial impact. Other factors like infection, dehydration, overheating, or direct mechanical disruption can worsen outcomes, but they don’t drive the immediate secondary injury cascade in the same fundamental way.