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Question 1

I. Cochlear hair cells
1. How many inner hair cells are there?

Answer 1

3500

Question 2

I. Cochlear hair cells
2. How many outer hair cells are there?

Answer 2

16000

Question 3

What does this graph indicate?

Answer 3

• Sound threshold intensities at different frequencies.
• The bottom curve indicates the absolute intensity needed to detect a sound.
• The dashed curve is the threshold for functional hearing.
• The top curve indicates levels at which sound is felt as painful.