Hydrogen cyanide exposure primarily does what to the body?

Hydrogen cyanide exposure primarily does what to the body?

• A. Interferes with cellular respiration
• B. Causes skin burns
• C. Increases oxygen uptake
• D. Causes hair loss

Answer: (A)

Hydrogen cyanide primarily disrupts how cells produce energy. It binds to cytochrome c oxidase in the mitochondria, blocking the final step of the electron transport chain. Because oxidative phosphorylation can’t occur, cells can’t use oxygen to make ATP, even when oxygen is present. This short-circuits cellular respiration and causes histotoxic hypoxia, leading to rapid weakness, confusion, seizures, and potentially death—especially in fire situations where cyanide is released. The effects aren’t about skin burns, increased oxygen uptake, or hair loss, which don’t reflect this fundamental block to cellular energy production.

Hydrogen cyanide primarily disrupts how cells produce energy. It binds to cytochrome c oxidase in the mitochondria, blocking the final step of the electron transport chain. Because oxidative phosphorylation can’t occur, cells can’t use oxygen to make ATP, even when oxygen is present. This short-circuits cellular respiration and causes histotoxic hypoxia, leading to rapid weakness, confusion, seizures, and potentially death—especially in fire situations where cyanide is released. The effects aren’t about skin burns, increased oxygen uptake, or hair loss, which don’t reflect this fundamental block to cellular energy production.