What is the primary function of the excretory system?

The primary function of the excretory system is to eliminate waste and toxins from the body. This system is essential for maintaining the body's internal environment, a process known as homeostasis. It works to remove harmful substances, including metabolic waste products, excess salts, and water through organs such as the kidneys, ureters, bladder, and urethra. By filtering the blood, the excretory system helps prevent the accumulation of harmful substances that could disrupt bodily functions or lead to health issues.

The other functions mentioned in the options, such as regulating hormones, producing energy, and supporting respiratory function, are associated with different systems in the body. For instance, the endocrine system regulates hormones, while the muscular and digestive systems are involved in energy production. The respiratory system is primarily responsible for gas exchange, which does not fall under the purview of waste elimination managed by the excretory system. Understanding the specific roles of each organ system helps outline their distinct contributions to overall health and functionality.