A hair cell makes no action potentials but by Dr. David Corey @MIT

Question 15 / 59: A hair cell makes no action potentials but nevertheless communicates the receptor potential to neurons in the spiral ganglion or vestibular ganglia.

Which of the following regarding this process are true? (3 points)

Choose 2

Transmitter is released, not by vesicles, but by a glutamate transporter running in reverse.

Voltage-gated calcium channels in hair cells open at relatively negative membrane potentials-near the resting potential-to evoke vesicle release.

The receptor potential is very large, peaking near +10 mV, which can open ordinary calcium channels.

Hair cells are electrically coupled by gap junctions to postsynaptic fibers.

Potassium entering through transduction channels in the stereocilia directly stimulates vesicle release.

Hair cells continuously release vesicles, and small changes in membrane potential modulate the release rate up or down.

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Introduction to Neuroscience Exam #3 (HST.131)

Author:

Dr.David CoreyInstructor

MIT

USA

Access: Public Partially Instant Grading

Attribution: Corey, David. HST.131 Introduction to Neuroscience, Fall 2005. (MIT OpenCourseWare: Massachusetts Institute of Technology), http://ocw.mit.edu/courses/health-sciences-and-technology/hst-131-introduction-to-neuroscience-fall-2005 (Accessed 12 Apr, 2014). License: Creative Commons BY-NC-SA

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