How does cyanide affect the human body?

How does cyanide affect the human body?

• A. causes kidney failure
• B. causes nerve damage and respiratory problems
• C. causes liver failure
• D. causes nerve failure and kidney damage

Answer: (B)

Cyanide prevents cells from using oxygen by inhibiting a key enzyme in the mitochondria (cytochrome c oxidase), so even though oxygen is present, cells can’t carry out aerobic respiration. This stops energy production, especially in tissues with high energy needs like the brain and the heart, leading to rapid neurological symptoms and breathing problems as the body struggles to function without usable cellular oxygen. That’s why the best description is nerve damage (neurological effects) and respiratory problems—the central nervous system and breathing are most immediately affected by the lack of usable oxygen. Direct kidney or liver failure isn’t the primary immediate effect of cyanide exposure, though severe hypoxia can contribute to organ stress later. The other options don’t reflect the primary mechanism or the most immediate clinical presentation.

Cyanide prevents cells from using oxygen by inhibiting a key enzyme in the mitochondria (cytochrome c oxidase), so even though oxygen is present, cells can’t carry out aerobic respiration. This stops energy production, especially in tissues with high energy needs like the brain and the heart, leading to rapid neurological symptoms and breathing problems as the body struggles to function without usable cellular oxygen.

That’s why the best description is nerve damage (neurological effects) and respiratory problems—the central nervous system and breathing are most immediately affected by the lack of usable oxygen. Direct kidney or liver failure isn’t the primary immediate effect of cyanide exposure, though severe hypoxia can contribute to organ stress later. The other options don’t reflect the primary mechanism or the most immediate clinical presentation.