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The Saccule in the Ear Allows You to Detect Change

Question 103

Multiple Choice

The saccule in the ear allows you to detect change in movement of your head due to a fluid called endolymph inside of the semicircular canals that surrounds sensory receptors and will resist the motion of your head. Now imagine that you are in an elevator going up to the 10th floor. You initially get on to the elevator, and feel a change as you begin to move upwards but then stop noticing the movement. When you get to the 10th floor you feel another change as the elevator comes to a stop. What is the most plausible explanation of what you felt, in the respective order?


A) As you begin to move upwards, otoliths also move upwards, releasing pressure on sensory receptors, equilibrates between floors, and finally press down on the receptors as the elevator comes to a stop.
B) When you start to move up, the endolymph presses down on the receptors due to gravity, then remains pressed down against the lower receptors, and finally puts pressure on the upper receptors as the elevator comes a stop.
C) When you start to move up, endolymph presses down on the receptors due to gravity, equilibrates between floors, then puts pressure on the lower receptors as the elevator comes to a stop.
D) As you begin to move up, otoliths press down on the receptors due to gravity, then equilibrate back to normal, then pull up and release pressure on the receptors as the elevator comes to a stop.

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