Which statement correctly describes the role of the last of the middle-ear bones?

Which statement correctly describes the role of the last of the middle-ear bones?

• A. It vibrates against the eardrum to start the process
• B. It is the outermost ear bone that collects sound
• C. It converts mechanical energy to electrical signals in the brain
• D. It is the last of the three middle-ear bones and transmits vibrations to the inner ear

Answer: (D)

The last bone in the chain of three middle-ear bones is the stapes, and its job is to transmit vibrations into the inner ear. It fits the oval window of the cochlea and acts like a tiny piston, moving the cochlear fluids and delivering the mechanical energy from the eardrum through the middle ear. This transmission is essential for converting airborne sound into signals the inner ear can process, and it also helps amplify the pressure that reaches the inner ear due to the stapes’ small contact area. So the statement that correctly describes its role is that it is the last of the three middle-ear bones and transmits vibrations to the inner ear. The other options describe functions of the eardrum, the outer ear, or the cochlear hair cells, which are not the role of this middle-ear bone.

The last bone in the chain of three middle-ear bones is the stapes, and its job is to transmit vibrations into the inner ear. It fits the oval window of the cochlea and acts like a tiny piston, moving the cochlear fluids and delivering the mechanical energy from the eardrum through the middle ear. This transmission is essential for converting airborne sound into signals the inner ear can process, and it also helps amplify the pressure that reaches the inner ear due to the stapes’ small contact area. So the statement that correctly describes its role is that it is the last of the three middle-ear bones and transmits vibrations to the inner ear. The other options describe functions of the eardrum, the outer ear, or the cochlear hair cells, which are not the role of this middle-ear bone.