MCAT BioChem Practice Question – Excitatory Neurotransmitter
- Jan 01, 2021
- MCAT Blog, MCAT Question of the Day
- Reviewed By: Liz Flagge
Which of the following is most likely the excitatory neurotransmitter released into the synaptic cleft between the inner ear hair cells and their spiral ganglion?
The neurotransmitter released by the inner ear hair cells is known to directly excite the spiral ganglion it innervates. Glutamate is the most common excitatory neurotransmitter in the brain, making D the most likely answer.
A. GABA: incorrect. GABA is an inhibitory neurotransmitter and would not be likely to directly excite the spiral ganglion.
B. Acetylcholine; incorrect. Acetylcholine does act as an excitatory neurotransmitter at the neuromuscular junction and in the periphery. However, glutamate is the most common excitatory neurotransmitter in the brain, making it the most likely answer.
C. Serotonin; incorrect. Serotonin is an inhibitory neurotransmitter and would not be likely to directly excite the spiral ganglion.
Want more MCAT practice?
We’ve got options for every schedule and learning style!
From the best online MCAT course created by top instructors with 524+ MCAT scores to the most representative full-length practice exams and private tutoring, we can custom tailor your MCAT prep to your goals!
Not sure which option is right for you? Schedule a free MCAT consultation with an MCAT expert using the form below. No obligation, just expert advice.
Create your Free Account to access our MCAT Flashcards
Search the Blog
Free ConsultationSchedule Now
Free MCAT Practice AccountNeed great MCAT practice?
Get the most representative MCAT practice possible when you sign up for our free MCAT Account, which includes a half-length diagnostic exam and one of our full-length MCAT practice exams.Learn More