Which statement best describes simple asphyxiants?

Which statement best describes simple asphyxiants?

• A. They irritate mucous membranes
• B. They are tasteless but harmless
• C. They cause chemical burns
• D. They displace oxygen

Answer: (D)

Simple asphyxiants cause harm by reducing the amount of oxygen available in the air, so the body can’t get enough oxygen even though the substance itself may be inert. They displace or dilute ambient oxygen, leading to symptoms from dizziness and confusion to unconsciousness in confined spaces, without involving direct chemical irritation or tissue damage. That’s why the statement that they displace oxygen best captures their effect. The other ideas describe irritants, tissue-damaging chemicals, or the misleading notion that being tasteless makes them harmless, which isn’t the case because the danger comes from oxygen deprivation, not chemical injury.

Simple asphyxiants cause harm by reducing the amount of oxygen available in the air, so the body can’t get enough oxygen even though the substance itself may be inert. They displace or dilute ambient oxygen, leading to symptoms from dizziness and confusion to unconsciousness in confined spaces, without involving direct chemical irritation or tissue damage. That’s why the statement that they displace oxygen best captures their effect. The other ideas describe irritants, tissue-damaging chemicals, or the misleading notion that being tasteless makes them harmless, which isn’t the case because the danger comes from oxygen deprivation, not chemical injury.