What target does carbon monoxide primarily affect?

• A. Nervous system
• B. Blood
• C. Liver
• D. Kidneys

Answer: (B)

Carbon monoxide primarily affects the blood, specifically by binding to hemoglobin in red blood cells. When inhaled, carbon monoxide competes with oxygen for binding sites on hemoglobin, forming carboxyhemoglobin. This reduces the blood's capacity to carry oxygen throughout the body, which can lead to tissue hypoxia and can severely impact vital organs and bodily functions. Consequently, the adverse effects of carbon monoxide exposure are predominantly seen in the blood, making it the primary target of concern when dealing with this hazardous gas. Understanding this mechanism is crucial for recognizing the health risks associated with carbon monoxide exposure and the importance of prompt treatment in cases of poisoning.