Overview. The major passages and structures of the upper respiratory tract include the nose or nostrils, nasal cavity, mouth, throat (pharynx), and voice box (larynx). The respiratory system is lined with a mucous membrane that secretes mucus. The mucus traps smaller particles like pollen or smoke.
About more than 50 percent of optometrists received an annual salary ranging from between $70,140 and $125,460. According to the Bureau of Labor Statistics, the median hourly wage for an optometrist is around $51.42 per hour which averages to about $106,960 per annum.
According to the BLS, the field of optometry is growing at a faster-than-average rate, with the number of job openings expected to increase by 24% nationwide through 2022. In May 2012, optometrists earned an average yearly salary of $109,810 (www.bls.gov).