Question

6.3 anatomy of the ear
anatomically, the ear is divided into three major areas: the external, or outer, ear, the middle ear, and the internal, or inner, ear (figure 8.11). the external and middle ear structures are involved with (1. ) only. the internal ear functions in both equilibrium and hearing.
external (outer) ear
the external ear, or outer ear, is composed of the auricle and the external acoustic meatus. the auricle (awri-kul), or pinna (pinnah), is what most people call the ear - the shell-shaped structure surrounding the (2. ) canal opening. in many animals, the auricle collects and directs sound waves into the auditory canal, but in humans this function is largely lost.
the external (3. ) meatus (or auditory canal) is a short, narrow chamber (about 1 inch long by 1/4 inch wide) carved into the temporal bone of the skull. in its skin-lined walls are the ceruminous (sə-roomi-nus) glands, which secrete waxy yellow (4. ), or earwax, which provides a sticky trap for foreign bodies and repels insects.
sound waves entering the auditory canal eventually hit the tympanic (tim-panik; tympanum = drum) membrane, or eardrum, and cause it to vibrate. the canal ends at the (5. ), which separates the external from the middle ear.

1. cerumen 2. eardrum 3. hearing 4. auditory 5. acoustic
2. eardrum 2. hearing 3. auditory 4. acoustic 5. cerumen
3. hearing 2. auditory 3. acoustic 4. cerumen 5. eardrum
4. acoustic 2. cerumen 3. eardrum 4. hearing 5. auditory
5. auditory 2. acoustic 3. cerumen 4. eardrum 5. hearing

Explanation:

1. The external and middle ear structures are involved with hearing. The internal ear does both balance (equilibrium) and hearing.
2. The auricle (pinna) is around the auditory canal opening.
3. The external acoustic meatus (auditory canal) is in the temporal bone.
4. Ceruminous glands secrete cerumen (earwax).
5. The auditory canal ends at the eardrum (tympanic membrane) which separates external and middle ear.

Answer:

1. hearing 2. auditory 3. acoustic 4. cerumen 5. eardrum