040 The Role of Hair Cells in Hearing

In this episode, Leslie Samuel explores the role of hair cells in hearing. The video begins with a recap of the cochlea's function and the basilar membrane's response to sound. It then delves into the specific role of inner hair cells, explaining how they transmit signals to the brain. The mechanics of hair cells, including the function of stereocilia and potassium channels, are discussed. The video also covers how potassium and calcium ions influence membrane potential, leading to neurotransmitter release. The episode concludes with a summary of how these processes connect to the auditory nerve and hearing.

What is the primary function of the basilar membrane in the cochlea?

• To produce earwax

• To protect the inner ear

• To vibrate in response to sound

• To amplify sound waves

How are the long and short stereocilia connected in hair cells?

• Through a chemical bond

• Via a mechanical gate

• By an electrical signal

• With a magnetic field

What happens when the mechanically gated potassium channels in hair cells open?

• Sodium ions flow into the cell

• Calcium ions flow into the cell

• Potassium ions flow into the cell

• Potassium ions flow out of the cell

What triggers the release of neurotransmitters in hair cells?

• Increase in membrane potential

• Decrease in membrane potential

• Presence of sodium ions

• Absence of calcium ions

What is the role of calcium ions in the hair cell's signal transduction process?

• They block potassium channels

• They trigger neurotransmitter release

• They decrease membrane potential

• They stabilize the cell structure