What happens after a stressful event regarding lead?

What happens after a stressful event regarding lead?

• A. The lead dissolves in tissue
• B. The lead becomes permanently trapped
• C. The lead is excreted immediately
• D. The lead leaves the bones and re-enters the bloodstream

Answer: (D)

Lead that has built up in bones acts as a long-term store. During a stressful event, bone turnover increases and bone is broken down, releasing stored lead back into the bloodstream. This mobilization raises blood lead levels even if external exposure hasn’t changed. Lead isn’t permanently trapped in bone, and it isn’t excreted immediately; its release into blood depends on bone resorption and is followed by gradual elimination from the body.

Lead that has built up in bones acts as a long-term store. During a stressful event, bone turnover increases and bone is broken down, releasing stored lead back into the bloodstream. This mobilization raises blood lead levels even if external exposure hasn’t changed. Lead isn’t permanently trapped in bone, and it isn’t excreted immediately; its release into blood depends on bone resorption and is followed by gradual elimination from the body.