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Health Studies (1,192)
HLTC22H3 (110)
Anna Walsh (54)

Chapter 8 Study notes

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Health Studies
Anna Walsh

Chapter 7- Aging and The Regulatory System SENSORY SYSTEM 5 senses Allows nervous system to gain information about the extrernal environment Age Related Changes Touch Skin is a sense organ Age related changes in: touch receptors (Meissners corpuscles) and pressure receptors (Pacinian corpuscles) Both decrease with age and in number and sensitivity Decreased ability to locate, identify and manipulate objects Smell Only about 10% decline Sensory neurons decrease in nasal lining and olfactory pathways Smoking causes most severe degradation May cause decrease in appetite, increases risk of food borne illnesses Taste Aging may cause minor decrease in sensitivity neurons Loss in taste occurs because of smoking, periodontal disease, illness and medications May lead to anorexia and increases mortality Hearings Changes affect both hearing and balance Sound goes from outer ear ear canal middle ear through vibrations in the eardrum Middle ear: 3 ossicleslittle bones that pass vibrations to oval window (hammer, anvil, and stirrup) Oval window: flexible membrane at beginning of inner ear Inner ear puts pressure on cochlea snail shell organ Inner e3ar is lined with the basilar membrane which has rows of neurons (thousands) Neurons make up the organ of Corti (hair cells contact nerve fibers and transmit acoustic signals to CNS Vestibule Complex structure in inner ear Allows organisms to sense gravity and head rotation Has 2 small gelatine filled sacs that have mineral particles and sensors Minerals press down on sensors and transmit information to brain With age: ear wax build up decreases hearing sensitivity Organ of Corti affected by wear and tear and otoxic medications Vestibule degrades leading to dizziness and falls Presbycusis hearing loss with age Men lose 80% by age 90, women lose only 30% Unable to hear high pitch sounds because of damage to shorter hair cells close to cochlea African men have less hearing loss genetic factor Tinnitus Ringing in the ears without a cause
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