Final answer:
The deflection towards the kinocilium is a phenomenon observed in sensory hair cells. When stimulated by sound waves or fluid vibrations, the stereocilia bend towards the kinocilium, triggering the release of neurotransmitters and transmitting sensory information to the brain.
Step-by-step explanation:
The deflection towards the kinocilium is a phenomenon observed in the sensory cells of the ear called hair cells. Hair cells have specialized structures called stereocilia that are arranged in rows of increasing height. Among these, one stereocilium is the longest and is known as the kinocilium.
When sound waves or fluid vibrations stimulate the hair cells, the stereocilia bend towards the kinocilium. This bending of the stereocilia triggers the release of neurotransmitters, which then transmits the sensory information to the brain.