Stimuli, Receptors and Responses - Part 2

Which of the following structures are parts of middle ear?

• Eustachian tube

• ear drum

• ear bones

• cochlea

Which of the following serves as the function(s) of ear bones?

• To transmit sound waves.

• To transmit sound vibrations.

• To amplify sound vibrations.

• To provide support.

Middle ear is

• filled with perilymph.

• filled with endolymph.

• filled with air.

Cochlea

• is fluid-filled.

• is a component of middle ear.

• has sensory hair cells to detect sound vibrations.

• has sensory hair cells to detect body movement.

Ear drum

• separates outer ear from middle ear.

• amplifies sound vibrations.

• converts sound waves into sound vibrations.

• is inelastic.

Hearing sensation is provided by

• ear drum.

• ear bones.

• cochlea.

• auditory centre of cerebral cortex.

Sensory hair cells in the cochlea

• detect vibrations of endolymph caused by sound waves.

• gives hearing sensation.

• initiate nerve impulses upon stimulation.

• serve as receptors.

If sensory hairs of ALL sensory hair cells are distorted,

• his auditory centre of cerebral cortex will then be malfunctioned.

• no sensory nerve impulses can be initiated by sensory hair cells.

• no hearing sensation is provided.

• sensory hair cells cannot be vibrated any more.

Eustachian tube

• connects middle ear cavity with pharynx.

• is fluid-filled.

• is to equalize air pressure on two sides of the ear drum.

• is blocked by valves.

Semicircular canals

• have sensory hair cells to detect sound vibrations.

• are fluid-filled.

• are located at middle ear.

• are responsible to detect change of position during movement.