MCAT Behavioral Sciences Question 25: Answer and Explanation

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Question: 25

10. Which of the following best describes the difference between endolymph and perilymph?

  • A. Endolymph is found in the vestibule, while perilymph is found in the cochlea.
  • B. Endolymph is found in the cochlea, while perilymph is found in the vestibule.
  • C. Endolymph is found in the membranous labyrinth, while perilymph is found in the bony labyrinth.
  • D. Endolymph is found in the bony labyrinth, while perilymph is found in the membranous labyrinth.

Correct Answer: C

Explanation:

Endolymph is the potassium-rich fluid that bathes the hair cells of the inner ear, all of which are found within the membranous labyrinth. Perilymph is found in the space between the membranous labyrinth and the bony labyrinth. Both the membranous labyrinth and bony labyrinth contribute to the cochlea and the vestibule, eliminating choices (A) and (B).

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