Class Notes (905,691)
CA (538,504)
UTSC (32,637)
Health Studies (1,217)
HLTC22H3 (110)
Anna Walsh (54)
Lecture

Chapter 7 Textbook notes

14 Pages
109 Views

Department
Health Studies
Course Code
HLTC22H3
Professor
Anna Walsh

This preview shows pages 1-3. Sign up to view the full 14 pages of the document.
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
www.notesolution.com
Middle ear: 3 ossicles/little 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
www.notesolution.com
May be due to ear infection high blood pressure, diabetes and tumours,
arthrosclerosis, medications and toxins
Vision
Light passes through cornea transparent, protects the eye
Muscles in the iris control amount of light that enters the eye
Retina back of the eye; has photoreceptors with rods and cones
Rods: transmit black and white information; found in peripheral regions of
retina
Cones: transmit colour; numerous in macula; centre of gaze
Whole eye structure is supported by humours (gel like substance) which also
transports nutrients and waste
Conjunctiva is a clear mucus membrane inside eyelids that also provides protection
with age, cornea, lens and vitreous humour diminish in transparency, making
the eye sensitive to glare
lens becomes yellow and decreases ability to differentiate between colours
also loses elasticity, making it difficult to focus on objects
makes driving problemtic
4main eye diseases:
1.Cataracts
Cloudiness and opacity of the lens
Interferes with vision and especially in bright sun or at night
Leading causes of blindness and treated with curgery
2.Glaucoma
Causes by increased buildup of aqueous humour in eye
Resultys in increased intraocular pressure and damage to retina and optic
nerve results in blindness
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
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 www.notesolution.com 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 www.notesolution.com
More Less
Unlock Document


Only pages 1-3 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit