What system does the vestibular system help maintain for balance?

The vestibular system primarily contributes to the maintenance of balance and spatial orientation, which is crucial for postural stability and coordinated movement. It works in conjunction with other sensory systems, including the visual system and proprioceptive input from muscles and joints, to provide the brain with information about head position and movement. This integration of information is essential for ensuring proper coordination and balance, making the nervous system the correct choice.

The other systems listed do not play a direct role in the maintenance of balance. The cardiovascular system is concerned with the circulation of blood and nutrients, the endocrine system regulates hormones and various physiological processes, and the digestive system primarily focuses on the breakdown and absorption of food. None of these systems directly contribute to the sensory inputs or processing required for balance, highlighting the unique role of the nervous system in this function.