Final answer:
The utricle and saccule are the two chambers within the vestibule involved in the sense of equilibrium, as part of the vestibular system that helps to maintain balance.
Step-by-step explanation:
The two chambers within the vestibule involved in the sense of equilibrium are the utricle and the saccule. These structures are part of the vestibular system, which is essential for maintaining our balance and sensing our body's position in space. Both the utricle and the saccule contain hair cells with stereocilia that respond to the head's position relative to gravity as well as linear acceleration.
When the head tilts, calcium carbonate crystals embedded in the gelatin around the hair cells shift, sending signals via the vestibular branch of the vestibulocochlear nerve to the brain, thus informing it about the change in position. This process allows the body to maintain balance and posture.