Which sequence represents the movement of lead after leaving the bloodstream to the bones?

Which sequence represents the movement of lead after leaving the bloodstream to the bones?

• A. Blood → Soft Tissue → Bones
• B. Blood → Bones → Soft Tissue
• C. Blood → Liver → Kidneys
• D. Blood → Brain → Soft Tissue

Answer: (D)

Lead moves from the blood into soft tissues first, then into bone where it tends to accumulate long-term. That makes the sequence blood → soft tissue → bones the best representation of how lead ends up being stored in the skeletal system. While lead can reach the brain quickly and liver/kidneys are involved in early distribution, those paths don’t show the bone as a major reservoir, which is the focus of the question.

Lead moves from the blood into soft tissues first, then into bone where it tends to accumulate long-term. That makes the sequence blood → soft tissue → bones the best representation of how lead ends up being stored in the skeletal system. While lead can reach the brain quickly and liver/kidneys are involved in early distribution, those paths don’t show the bone as a major reservoir, which is the focus of the question.