Certified Instrument Specialist (CIS) Practice Exam 2026 - Free CIS Practice Questions and Study Guide

The correct answer, which identifies the genitourinary system, encompasses both the reproductive and urinary organ systems. This combined approach is essential because the genitourinary system plays a crucial role in both reproduction and the elimination of waste products from the body.

The urinary system is responsible for filtering blood, removing waste, and regulating water and electrolytes, while the reproductive system is involved in producing gametes (sperm and eggs), hormones, and facilitating reproduction. Together, these systems interact and support essential physiological functions, such as urinary excretion and reproductive processes.

By contrast, other options refer to entirely different systems. The endocrine and exocrine systems are related to hormone production and secretion, primarily influencing metabolism and growth. The urinary system alone would lack the reproductive components integral to the genitourinary system. Lastly, the respiratory and circulatory systems are concerned with gas exchange and blood circulation, which do not pertain to the functions of the genitourinary anatomy. Understanding the proper distinction and relationship between these systems is key in the field of health and biological sciences.