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- Occupational Hearing Loss Frequent exposure to loud noise of a particular pitch can cause loss of hair cells in the part of the cochlea that responds to that pitch. People who work with or around noisy machinery are at risk for such frequency-specific hearing loss. Taking precautions such as using ear plugs to reduce sound exposure is important. Noise-induced hearing loss can be prevented, but once it occurs it is irreversible because dead or damaged hair cells are not replaced. FIGURE 33.11 shows the threshold decibel levels at which sounds of different frequencies can be detected by an average 25-year-old carpenter, a 50-year-old carpenter, and a 50-year-old who has not been exposed to on-the-job noise. Sound frequencies are given in hertz (cycles per second). The more cycles per second, the higher the pitch. FIGURE 33.11 Effects of age and occupational noise exposure on hearing. The graph shows the threshold hearing capacities (in decibels) for sounds of different frequencies (given in hertz) in a 25-year-old carpenter (blue), a 50-year-old carpenter (red), and a 50-year-old who did not have any on-the-job noise exposure (brown). Which sound frequency was most easily detected by all three people?This arrow is pointing in a/an ___________________________________________ direction .Occupational Hearing Loss Frequent exposure to loud noise of a particular pitch can cause loss of hair cells in the part of the cochlea that responds to that pitch. People who work with or around noisy machinery are at risk for such frequency-specific hearing loss. Taking precautions such as using ear plugs to reduce sound exposure is important. Noise-induced hearing loss can be prevented, but once it occurs it is irreversible because dead or damaged hair cells are not replaced. FIGURE 33.11 shows the threshold decibel levels at which sounds of different frequencies can be detected by an average 25-year-old carpenter, a 50-year-old carpenter, and a 50-year-old who has not been exposed to on-the-job noise. Sound frequencies are given in hertz (cycles per second). The more cycles per second, the higher the pitch. FIGURE 33.11 Effects of age and occupational noise exposure on hearing. The graph shows the threshold hearing capacities (in decibels) for sounds of different frequencies (given in hertz) in a 25-year-old carpenter (blue), a 50-year-old carpenter (red), and a 50-year-old who did not have any on-the-job noise exposure (brown). How loud did a 1,000-hertz sound have to be for the 50-year-old carpenter to detect it?
- Watch this short video (http://openstaxcollege.org/l/facialnerve) to see an examination of the facial nerve using some simple tests. The facial nerve controls the muscles of facial expression. Severe deficits will be obvious in watching someone use those muscles for normal control. One side of the face might not move like the other side. But directed tests, especially for contraction against resistance, require a formal testing of the muscles. The muscles of the upper and lower face need to be tested. The strength test in this video involves the patient squeezing her eyes shut and the examiner trying to pry her eyes open. Why does the examiner ask her to try a second time?CHAPTER 15 The Special Senses HAPT ne s SECTION 3 Review Labeling Label the structures in the following diagram of the right ear. 2 Middte ear itiple ect the A blir 1EXternal ear 3Internal ear 10 The 11 Cranial nerve VIlI External lacoustic meatus d Cartilage Tympanic membrane Auditory tube Label the structures in the following micrograph of the internal ear. 14 15 16 17 e ano 18 soibnl 19 20 1sed adi to nolldiv ongade lenotaot ait taniope eles Section integration For a few seconds after you ride an express elevator from the 25th floor to the ground floor, you still ot og oro feel as if you are descending, even though you have come to a stop. Why? a t causes the maculae in the saccule op Your vestibule to slide upward, while producing the sensation of downward vertical motion when the elevabr Stops, t'll take a few seconds For the maculae to come to rest. As long as the maculae is displaced, move ment will be Perceived.Myopia is connected with ? ears lungs eyes None of these
- High pitch sounds are heard when the ______. longer more flexible fibers in the basilar membrane vibrate region of the basilar membrane closest to the oval window vibrates entire basilar membrane vibrates equally but at a high frequency entire basilar membrane vibrates equally but at a low frequencyGiven this picture with cilia bending with gravitational force within the ear, we would know that it is part of cochlea O semicircular canal saccule utricleA ruptured tympanic membrane DIRECTLY affects the movement/vibration of which ossicle? Incus Malleus Stapes Anvil
- there is profuse anastomosis between the branches of the two internal carotid arteries and the two vertebral arteries to supply to the retina O true O FalseIdentify the indicated part of the brain.Cutaneous pain :-a- is always sharp in characterb- is transmitted by Aδ sensory fibersc- is always followed by hyperalgesiad- evokes spasm of nearby muscles
