What substance prevents oxygen from combining with the blood or from being used by body tissues?

What substance prevents oxygen from combining with the blood or from being used by body tissues?

• A. Proportioning
• B. Hydrostatic Test
• C. Expellant Gas
• D. Asphyxiant

Answer: (D)

Asphyxiants are substances that cause suffocation by depriving the body's tissues of oxygen, either by diluting the oxygen in the air or by blocking the body's ability to use oxygen. In this sense, the described substance prevents oxygen from combining with the blood or being used by body tissues, which is exactly what an asphyxiant does. Examples include simple asphyxiants like nitrogen that dilute ambient oxygen, and chemical asphyxiants like carbon monoxide or hydrogen cyanide that interfere with oxygen delivery or cellular respiration. The other terms refer to processes or concepts not about gases that block oxygen use, so they don’t describe a substance that causes asphyxia.

Asphyxiants are substances that cause suffocation by depriving the body's tissues of oxygen, either by diluting the oxygen in the air or by blocking the body's ability to use oxygen. In this sense, the described substance prevents oxygen from combining with the blood or being used by body tissues, which is exactly what an asphyxiant does. Examples include simple asphyxiants like nitrogen that dilute ambient oxygen, and chemical asphyxiants like carbon monoxide or hydrogen cyanide that interfere with oxygen delivery or cellular respiration. The other terms refer to processes or concepts not about gases that block oxygen use, so they don’t describe a substance that causes asphyxia.