How do anticoagulant pesticides primarily affect rodents?

Anticoagulant pesticides primarily affect rodents by disrupting their blood clotting mechanism, leading to internal bleeding. These compounds inhibit the action of vitamin K, which is essential for the synthesis of certain clotting factors in the liver. When a rodent ingests an anticoagulant poison, it can lead to a cascade of internal hemorrhages, resulting in weakness, lethargy, and eventual death due to blood loss.

Understanding the mechanism of action of anticoagulants is crucial for pest control methods, as this information helps in the effective and safe application of these pesticides to manage rodent populations. The other options, although they refer to potential effects caused by different types of pesticides or biological conditions, do not accurately represent the primary action of anticoagulant pesticides.