Textbook Notes (362,790)
Canada (158,054)
HLTC22H3 (102)
Anna Walsh (49)
Chapter 7

Chapter 7 notes

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University of Toronto Scarborough
Health Studies
Anna Walsh

AGING AND THE REGULATORY SYSTEMS Sensory system. - Composed of five senses: touch, smell, taste, hearing, vision - Allow the nervous system to gain info. About the external environment Age and disease related changes - Touch o Skin is sense organ for touch o Meissners corpuscles and pacinian corpuscles o With age, these receptors decrease both in number and in sensitivity o Diabetic neuropathy - Smell o 10% decline in sense of smell with age o Sensory neurons decrease in the nasal lining and olfactory pathways o Smoking degrades sensory neurons more o First indicator of Alzheimers disease is decrease in sense of smell o Degradations in smell may impair appetite o Risk of food-borne illnesses o Decrease in ability to smell leaking gas... this is dangerous - Taste o Taste buds can sense salt, sweet, sour, bitter, fat, umami o Umami is composed of glutamate monosodium glutamate (MSG) o Gradual losses in taste may be due to smoking, periodontal disease, illness, medications o Loss of taste can lead to anorexia - Hearing o Middle ear contains three ossicles that pass vibrations to the oval window o Cells in the ear canal generate earwax o The organ of Corti may be affected by atherosclerotic changes in the capillaries that provide nutrients to it o Ototoxic medications o Structures of inner ear that sense gravity and head position can degrade over time o Presbycusis hearing loss with age o The shorter hair cells at the beginning of the cochlea respond to the highest frequencies and suffer the greatest wear and tear o Study showed that prevalence of hearing impairment nearly doubled between 1965 and 1994, especially for men o Risk factors include loud noise, ototoxic drug use o Leads to decreased willingness to communicate with others www.notesolution.com
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