Heavy metals, such as lead, mercury, and cadmium, can have detrimental effects on living organisms. These metals are toxic and can accumulate in biological systems, leading to a range of health issues. In organisms, heavy metals can disrupt essential biological processes, impair neural function, and cause damage to organs. For example, exposure to mercury can result in neurotoxic effects, while cadmium affects kidney function. Overall, heavy metal contamination poses serious risks to both human health and the environment.