Explain how sound is perceived by the ear.

eardrum moved by sound waves;
eardrum/tympanic membrane causes movement of the malleus/bones of the middle ear/ossicles;
bones of the middle ear/malleus, incus and stapes/hammer, anvil and stirrup amplify/magnify movement;
bones of the middle ear/stapes push on the oval window;
causing movement of fluid/vibration within the cochlea/inner ear;
hair cells are mechanoreceptors;
which release a chemical neurotransmitter when stimulated;
sounds/vibrations are transformed into nerve impulses/action potentials;
carried by auditory nerve to brain;
round window releases pressure so fluid in cochlea can vibrate;

Many candidates were able to get 5 or 6 marks for this section on the ear. This seemed well taught.