Chapter 36, Problem 2STP

Summary Introduction

Introduction :

Ear helps us to hear things. The primary function performed by the ear is to hear and balance. The receptors in the ear can detect both high and low volumes. Canals of the ear help in maintaining balance.

Answer to Problem 2STP

Correct answer :

The correct answer is option (D) 4.

Explanation of Solution

Explanation/justification for the correct answer :

Option (D) 4. The number 4 indicates cochlea. The cochlea contains sensors for the auditory nerves. The cochlea is an auditory inner ear. Its structure is that of a snail and is present in the inner ear that converts sound into neural input. The cochlea’s purpose is to change the cochlear fluid and similar structures into a neural signal. The cochlea is filled with tiny hair cells and fluid. So, this is the correct option.

Explanation for incorrect answer :

Option (A) 1. The number 1 indicates malleus. Malleus is the part of the inner ear and it does not contain sensors for the auditory nerves. So this is an incorrect option.

Option (B) 2. The number 2 indicates incus. Incus is the part of the middle ear and after that inner ear has a structure called the cochlea and it is filled with fluid and hair cells. The cochlea contains sensory nerves. So, this is an incorrect answer.

Option (C) 3. The number 3 indicates stapes. Stapes is one of the three bones present in the middle ear. It does not have sensors for the auditory nerves. So, this is an incorrect option.