A patient with autoimmune hemolytic anemia experiences increased red blood cell destruction. Which mechanism explains why IgG autoantibodies cause this destruction?

💡 Explanation

In autoimmune hemolytic anemia, IgG autoantibodies bind to red blood cells, which then triggers complement activation, leading to membrane attack complex formation and cell lysis, because complement-mediated lysis directly destroys the cells. Therefore complement activation explains the destruction, rather than direct T-cell cytotoxicity or erythropoietin receptor blockade, which are less common mechanisms in this condition.

• Why does administering a loop diuretic to a patient with impaired renal function potentially lead to severe hypokalemia?
• A woman with consistently high estrogen levels experiences irregular menstrual cycles; which physiological process is most likely disrupted?
• Which outcome occurs when antithrombin III's activity is significantly reduced in blood plasma?
• During hemorrhagic shock, the kidneys increase 2,3-BPG production in red blood cells; which consequence follows in systemic oxygen transport?
• As individuals age, the risk of sarcopenia increases, leading to reduced muscle mass and strength. Why does age-related decline in satellite cell function contribute significantly to this condition?
• Which outcome is caused by the increased resistance across demyelinated axons?