How does inhaling carbon monoxide primarily affect the human body?

Inhaling carbon monoxide primarily affects the human body by interfering with the ability of blood cells to carry oxygen. Carbon monoxide binds to hemoglobin in red blood cells more readily than oxygen does, forming carboxyhemoglobin. This binding reduces the overall availability of hemoglobin for oxygen transport, leading to decreased oxygen delivery to tissues and organs. As a result, the body can suffer from tissue hypoxia, which can manifest in symptoms such as headaches, dizziness, weakness, and in severe cases, loss of consciousness or even death.

This mechanism underscores the dangerous nature of carbon monoxide exposure, especially in enclosed spaces or situations where ventilation is poor. The other options do not reflect the impact of carbon monoxide inhalation accurately; rather, they suggest beneficial effects on health, which is misleading in the context of carbon monoxide exposure.