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Lecture

EESA10H3 Lecture Notes - Breast Cancer, Chemical Hazard, Occupational Hazard


Department
Environmental Science
Course Code
EESA10H3
Professor
Jovan Stefanovic

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Lecture 10: Environmental Hazards to Specific Populations
Environmental Hazards to Specific Populations:
1. Children’s environmental health
2. Women’s health and environment
3. Workers and noise hazards
4. Elderly (in high risks) and environmental health
1A. Children’s Environmental Health – why are they so sensitive?
Different exposure patterns between children and adults (don’t act or even have everyday routine
as adults)
The limited diet of children
Behavior unique to children
How and where children spend their time
The impact of short stature
The limited diet of children
• Eat, drink 3-4 times more food/drinks in proportion to their body size than adults
• Fewer types of food (adults eat more variety). Example: Breast milk (composed of 3% fat)
• Large quantities of specific foods (kids eat some food more than adults based on diff stuff i.e.
10-15% more apple juice or pears)
• Drink more water relative to their body weight (4 times more than teenagers) Teenagers drink
more soft drinks and sodas.
Behavior unique to children
• Mouthing behavior (2-6 olds touch their mouths about 9 times every hour)
– Ingestion of soil (Deliberate or compulsive behavior): kids with disabilities do it even
more.
– Paint: source of lead. Kids coz of the curiosity can ingest that.
– Small objects like magnets (affect intestines to cause fatal illnesses)
– Infectious agents: don’t wash hands etc.
– Disinfection byproducts: drinking chlorinated water cause more harm to kids than
adults.
• Participation in certain athletics and/or risky activities
– Construction sites: physical hazard (asbestos) and chemical hazard.
– Swimming
– Risky playing activities: backyards, storage rooms we could store pesticides, household
chemicals etc
– Exposure to sun: kids safer than adults as their mommies take care of them (sunscreen)
– Smoking-adolescents
How and where children spend their time
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• Spend most of their time indoors
• Crawling and playing on the floor (dust, pollutants, infectious agents, radon)
• Playing on the grass (pesticides, skin infections)
They are more exposed as they are closer to the ground. Sometimes if they play on the grass
which has residuals of pesticides, it can cause some infections. Also kids can get skin infections
like Zoonosis (from animals to human transfer)
The impact of short stature
• The breathing zone of the adults is 4-6 feet above the floor or ground
• For children is much lower
1B. Children’s Environmental Health
Physiological differences between children and adults
• Higher metabolic rate in children (burn calories faster)
• More active than adults (eat more, drink more, breath more air)
Dermal adsorption
– higher ratio of skin surface area to body weight than adults,
– skin is more permeable
Gastrointestinal adsorption
– large surface area of intestines (large surface area makes more chemicals to enter the
body)
– prolong gastric emptying time (babies younger than 1 year need about 6 hours from
ingestion to excretion. Usually adults need only about 4 hours.)
– calcium-lead transport mechanism (for strong bones). Physiologically kids absorb
calcium more. Note: children absorb 50% of ingested lead while adults absorb only 10%.
– lower stomach acidity (especially in first year of life, reduce toxicity of some chemicals
not always increase it. Lower acidity in kids, the heavy metals would b more bioavailable
and toxic).
Respiratory adsorption
– Breath twice as much air
Blood- brain barrier (mechanism to prevent entrance to the brain from the blood)
depends on age: only adults have it!!
• Greater blood flow to the brain and other organs
• The size of the some organs relative to body mass is greater (Brain is 13% total size/body mass
for the kids and only 2% for adults)
• Biotransformation processes are less developed
• Rapid growth and development
• More time to develop chronic diseases (kids have the whole life to develop diseases)
2. Women’s Health and Environment
Statistics show increased cases in asthma and associated with new stuff invented/discovered
every day. More allergens seen every day and kids more exposed to them. Stuff quite reactive for
them. Tendency increasing in some types of cancers. Mostly associated with environmental
hazards.
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