<prompt> The organ of Coi normally contains:A single row of inner hair cells and a single row of outer hair cells3-4 rows each of inner and outer hair cellsA single row of inner hair cells and 3-4 rows of outer hair cellsA single row of outer hair cells and 3-4 rows of inner hair cells  <response>: Organ of Coi organ for transduction of sound. Hair cells are receptor cells in organ of Coi There is a single row of inner hair cells toward the center of cochlea and 3-4 rows of outer hair cells on the outer side. Each row contains about 3000 hair cells. 