Question Detail

ZOO 101 ZOO 101 Past Questions Objective Question
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Question

Which one of the following statements is correct?
Options
A Perilymph is positively charged and endolymph is negatively charged.
B Perilymph and endolymph are positively charged.
C Perilymph is negatively charged and endolymph is positively charged.
Correct Answer
D Perilymph and endolymph are negatively charged.
Correct Answer

Option C is the correct answer.

Detailed Explanation

In the inner ear, the endolymph (found in the membranous labyrinth, including the scala media) has a positive electrical potential (approximately +80 mV relative to perilymph), primarily due to high K+ concentration and active transport by the stria vascularis. The perilymph (found in the scala vestibuli and scala tympani) is negatively charged relative to endolymph and has a composition similar to extracellular fluid.

Hint

Recall the ionic composition and electrical potential differences between these two inner ear fluids.

Question Info

Course: ZOO 101
Topic: ZOO 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 859 of 2214
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