What is one potential effect of toxic substances on the human body?

Toxic substances can lead to physical pathological changes in the human body due to their harmful effects. When the body is exposed to toxins, these substances can disrupt normal biological processes, leading to cellular damage, inflammation, organ dysfunction, and various ailments. Pathological changes may manifest in different ways, such as tissue damage, the development of diseases, or alterations in normal physiological functions. This answer is foundational in understanding the significant risks posed by environmental, occupational, or chemical exposures, illustrating how toxicity adversely impacts health.