Question

The opening and closing of ion channels within the hair cell cilia ?

1) are a function of the voltage of the cilia membrane.
2) reflect the action of a second messenger within the cilia.
3) are controlled by ionotropic membrane receptors.
4) reflect tension exerted by the tip links on the insertional plaques.
5) are the result of chloride entry into the hair cell.

Answer 1

The opening and closing of ion channels within the hair cell cilia is controlled by tension exerted by the tip links on the insertional plaques.

Step-by-step explanation:

The opening and closing of ion channels within the hair cell cilia is controlled by tension exerted by the tip links on the insertional plaques. When the stereocilia of the hair cells in the organ of Corti are bent by vibrations, the tip links pull on the insertional plaques, opening gated ion channels and allowing ions to enter the hair cell. This causes depolarization of the hair cell membrane and the transmission of a signal to the cochlear nerve.