Which body system regulates fluid and electrolyte balance and eliminates certain wastes?

• A. Nervous system
• B. Endocrine system
• C. Urinary/excretory system
• D. Respiratory system

Answer: (C)

The urinary/excretory system is primarily responsible for regulating fluid and electrolyte balance in the body, as well as for the elimination of certain wastes. This system includes structures such as the kidneys, ureters, bladder, and urethra.

The kidneys play a crucial role in filtering blood to remove waste products and excess amounts of water and electrolytes. They maintain homeostasis by adjusting the reabsorption of water and various ions based on the body’s needs. For instance, if the body is dehydrated, the kidneys will conserve water by concentrating urine. Conversely, if there is excess fluid, the kidneys will excrete more water, producing dilute urine.

Additionally, the urinary system is instrumental in regulating blood pressure, pH levels, and the body’s overall fluid balance. By filtering waste and surplus substances from the bloodstream, this system contributes significantly to the safe removal of potentially toxic metabolites, ensuring that the body remains in a healthy state.