Question

Identify the sequence in which the sound vibrations reach the brain:
$\begin{array}{cc}\text{Parts}& \text{Function}\\ \left(a\right)\text{External ear}& \left(i\right)\text{Amplifies the vibrations received on the tympanic membrane.}\\ \left(b\right)\text{Middle Ear}& \left(ii\right)\text{Converts the vibrations into nerve impulses and sends them to brain.}\\ \left(c\right)\text{Inner Ear}& \left(iii\right)\text{Directs the sound waves towards the tympanic membrane.}\end{array}$

• A. a-i, b-iii, c-ii
• B. a-iii, b-i, c-ii
• C. a-ii, b-iii, c-i
• D. a-ii, b-i, c-iii

Answer 1

The correct option is B a-iii, b-i, c-ii

The auditory sensation involves the participation of all three parts of the ear. The external ear collects the sound waves and sends it to the middle ear which in turn amplifies the received vibrations. Middle ear transmits these vibrations to the inner ear. The auditory nerve in the inner ear converts these vibrations into nerve impulses and sends it to the brain to obtain a sensory response.