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HLTC22H3 (110)
Anna Walsh (54)
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Department
Health Studies
Course
HLTC22H3
Professor
Anna Walsh
Semester
Summer

Description
HLTB01H3S: Health, Aging and the Life Cycle A&G: Ch 7-Aging and the Regulatory Systems. In order for the organs to function properly, they must be able to recognize changes in both the external and internal environment and be able to communicate with each other to maintain homeostasis, avert dangers, and manage growth. Includes: sensory, nervous, endocrine and immune systems Sensory Systems The sensory system is composed of five senses: touch, smell, taste, hearing and vision. Sensory organs allow the nervous system to gain information about the external environment. Touch skin is the sense organ o Touch receptors (Meissners corpuscles) and pressure receptors (Pacinian corpuscles) o Decrease in number and sensitivity with age Smell decrease number of sensory neurons in nasal lining and olfactory pathways to the brain o Loss of smell may be indicative of Alzheimers (olfactoryhippocampus) Taste differing opinions whether taste declines with age Hearing age related changes in hearing and balance o Sound is transmitted through the outer ear via the ear canal into middle ear through vibrations in the eardrum o Middle ear contains 3 ossicles that pass vibrations to the oval window o Fluid in inner ear puts pressure on the cochlea, lined with the basilar membrane, which has many neurons (make up organ of Corti) o Vestibule allows organisms to sense gravity and head rotation o Ototoxicity: means by which hearing loss is induced by taking medication o Presbycusis: hearing loss with age, moss common hearing problem o Strawbridge, Wallhagen, Shema and Kaplan (2000) found a dose- response curve between hearing impairment and problems in other domains; there was a linear increase in problems in physical health, mental health and social functioning with each decrement in hearing ability o Tinnitus: defined as a ringing in the ears with no discernable cause Vision cones = colour; rods = black&white, but more sensitive to light o cones mostly in center (macula) of retina whereas rods are in the periphery o whole structure supported by gel-like substances called humors in the chambers in the eye o cornea, lens and vitreous humor (protect) decrease in transparency w age o Presbyopia: lens loses elasticity; hard to focus on near objects (common) 1 www.notesolution.com
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