1. It is surprising all the noises that you can hear in the classroom even when everyone is quiet. Well, what are they? Write down everything you can hear when everyone is trying to be quiet.

2. Can You Hear Me Now?

3. Audition: The sense of hearing.
Pitch: How high or low a sound is.
Timbre: The complexity of the sound.
Intensity: How loud a sound is.
Decibels: The measure of how loud a sound is (its intensity).

4. 8. Hair Cells: Receptor cells for hearing found in the cochlea.
6. Eardrum: A piece of skin stretched over the entrance to the ear; vibrates to sound.
7. Cochlea: A snail shaped part of the ear, filled with fluid and small hairs that vibrate to incoming sound.
8. Hair Cells: Receptor cells for hearing found in the cochlea.
9. Cilia: Hair like extensions on cells.
10. Auditory Nerve: Bundle of nerves carrying sound to the brain.

5. How are Smell and Taste Connected?

6. Olfaction: The sense of smell.
Olfactory Bulbs: Units that receive odor molecules and communicate their nature to the brain.
Pheromones: Odor chemicals that communicate a message.
Taste receptors: Chemical receptors on the tongue that decode molecules of food or drink to identify them.