Which of the following is a characteristic of blood agents?

• A. They are primarily dermal irritants
• B. They act as respiratory suppressants
• C. They remain effective in solid form
• D. They induce allergic reactions

Answer: (B)

Blood agents, such as hydrogen cyanide and carbon monoxide, work by interfering with the body's ability to use oxygen. They are primarily toxic when inhaled, affecting the respiratory system and ultimately leading to respiratory failure. This characteristic makes them particularly dangerous in situations involving exposure to air, thereby classifying them as respiratory suppressants.

Understanding the mechanisms of blood agents reveals that they do not primarily act as dermal irritants, nor do they remain effective in solid form, as their toxicity is significantly reliant on vapor presence in the air. Additionally, blood agents do not invoke allergic reactions; rather, they directly poison bodily systems, emphasizing their role as respiratory suppressants instead.