Product Catalog
Generic Norplant (Lenor - 72, Norplant® equivalent)
Lenor - 72 is a form of progesterone, which is a female hormone involved in conception. Lenor - 72 is used as an emergency contraceptive (EC) to prevent pregnancy after contraceptive failure or unprotected intercourse. Lenor - 72 prevents ovulation disrupts fertilization, and inhibits implantation.
This product will arrive to you in 14-24 business days (free shipping worldwide)
0.075mg
| Quantity | Price | Price per pill | Returning customer price | Bonus | |
|---|---|---|---|---|---|
| 2 | $ 30.00 | $ 15.00 | $ 27.00 | ---- | Add to cart |
| 4 | $ 35.00 | $ 8.75 | $ 31.00 | ---- | Add to cart |
| 6 | $ 39.00 | $ 6.50 | $ 35.00 | ---- | Add to cart |
Drug Medical Information
AGE AND BEHAVIOR: CONTACT WITH THE PHYSICAL ENVIRONMENT – HEARING - PITCH-THRESHOLD
The hearing loss in old age is not equal across all frequencies of sound. High pitch tones, such as those a soprano can reach, are progressively less audible for the elderly while those of lower pitch are better heard. So many studies have documented this by now that several of the more recent reports have taken to combining the various studies. For example, Kryter (1960) compared the results of five studies and Spoor (1967) compared the results of eight. The problem of high tone disability (presbycusis) is depicted in Figure 10.1, extracted from the report by Spoor.
The "normal" human ear can hear sounds ranging in pitch from 20 vibrations per second to 20,000 per second. The very bass sounds or the very soprano sounds, however, have to be much louder than the middle frequency sounds if they are to be heard. In the measurement of hearing ability, a wide range of frequencies is presented and the loudness level (measured in decibels, db) necessary to hear each frequency is recorded. When it is said that the old suffer presbycusis, it means that the sounds have to be made progressively louder as the frequencies are increased.
The decline with age is relatively slight with tones of frequencies less than 1,000 vibrations per second (Hz). A 1,000 Hz tone is similar to that heard on the piano when a note two octaves above middle C is played. While the decline with age in hearing tones lower than 1,000 Hz is slight—it is only about five db from age 25 to 50 years—it is progressive; that is, the decline is somewhat greater, for example, between ages 75 and 85 than it is between 25 and 35.
Presbycusis becomes really apparent after age 50 with pitches above 1,000 Hz. As the frequencies are increased, loudness levels must be raised progressively for the older person to hear the tones at all. For men at age 50, with tones approximately 4,000 Hz (the highest note on the piano), the hearing loss is 17 db or more; at age 75, the loss is more than47 db. At age 60, it is typically difficult to hear a tone one octave higher than the highest one on the piano (8,000 Hz); the loss with age is about 35 db. The higher the frequency and the older the person, the louder will the tone need to be to be heard. For practical, everyday purposes, however, high-tone deafness for frequencies above 3,000, perhaps 4,000 Hz, is not too important.
For some reason, this aging pattern is more pronounced with men than with women. It has been suggested that men are subject to greater "noise pollution" than are women because their jobs more often provide such hazards. This suggestion receives more support in a series of studies which showed that where the environment is low in such hazards the percentage of old people who are poor hearers is lower than otherwise (Rosen, Bergman, Plester, El-Mofty, and Sath, 1962; Rosen, Plester, El-Mofty, and Rosen, 1964; Bergman, 1966). This indicates that at least part of the problem of presbycusis is environmental. Causes for presbycusis are multiple, encompassing age changes all the way from the inner ear to the auditory cortex. While deterioration has been demonstrated in the auditory sense organ (the cochlea), this has not been seen as sufficient to account for the loss in hearing sensitivity. Higher nervous system centers are also involved.
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