What are the primary functions of the organs in the genito-urinary system?

The correct answer highlights the dual roles of the genito-urinary system, which comprises organs responsible for both reproductive and urinary functions. The urinary part of this system is tasked with filtering and excreting waste and excess substances from the blood via urine, thereby playing a crucial role in maintaining the body's fluid and electrolyte balance. This includes regulation of blood volume, pressure, and pH levels.

On the reproductive side, the organs involved facilitate reproduction through the production of gametes (sperm in males, ova in females) and the hormones that regulate sexual function and reproductive cycles. This integration of both reproductive and urinary functions is essential for the survival and continuation of species, making the genito-urinary system vital for both individual health and overall population dynamics.

The other choices relate to different bodily systems: hormone regulation and growth pertain to the endocrine system, body function coordination and environment monitoring are mainly functions of the nervous system, and digestion and waste elimination involve the gastrointestinal system. Therefore, these options do not accurately represent the primary functions of the genito-urinary system.