Whether the hearing decline in the 50-year old carpenter was caused by age or by job-related noise exposure. Introduction: Hearing refers to the perception of sound. The loudness of sound is measured in decibels. The frequency of sound is measured as the number of wave cycles per second or hertz. The range of frequency that can be heard by human ears is 20-20,000 hertz. The hearing ability of individuals varies depending on their age, gender, and occupation. Continuous exposure to loud noises can damage hair cells in the inner ear that may result in a temporary or permanent hearing loss.

Question

More than 1.1 billion young adults are at risk for hearing loss according to World Health Organization (WHO, 2015). The primary reason is increasing use of personal audio devices with headphones or earphones. Hearing loss is of two main types: conduction deafness and perception deafness. Young adults are more likely to experience perception or nerve deafness. Which of the following parts of the ear is not involved in nerve deafness? Select one: a. Organ of Corti b. Semicircular canal C. Auditory nerve and basilar membrane d. Sensory neurons and hair cells

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Question

Chapter 33, Problem 4DAA

Summary Introduction

To determine: Whether the hearing decline in the 50-year old carpenter was caused by age or by job-related noise exposure.

Introduction: Hearing refers to the perception of sound. The loudness of sound is measured in decibels. The frequency of sound is measured as the number of wave cycles per second or hertz. The range of frequency that can be heard by human ears is 20-20,000 hertz. The hearing ability of individuals varies depending on their age, gender, and occupation. Continuous exposure to loud noises can damage hair cells in the inner ear that may result in a temporary or permanent hearing loss.

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