Environmental Toxins

October 31, 2011 in SVN3E by Jennifer Faulkner

Common Pollutants

In today’s world there are very few places, if any, that are not affected by human activities. Even in the high arctic, winds and water currents carry environmental contaminants, such as heavy metals and industrial chemicals, from the south.

Many of these environmental contaminants are not only a threat to wildlife and the natural environment, but to the health of people living in the area.

There are many different substances that are released into the environment and may pose a threat to human health.

 

Heavy Metals

Living things require varying amounts of some heavy metals, such as iron and zinc. Too much of these metals can be toxic to living things. Other heavy metals such as mercury and lead are not required by living things, and their accumulation over time can cause serious illness.

 

The most common source of heavy metal pollution is from the smelting of ores when purifying other metals. Heavy metals do not break down in the environment and can pose health and environmental risks for years.

 

Pesticides
The chemicals used by farmers, and on our lawns to kill weeds, insects and other pests, can pose serious environmental and health concerns if used incorrectly. Spraying pesticides on windy days, or just before it rains, or near streams and ponds, increases the chance that these chemicals will contaminate nearby water supplies putting people at risk.

Workplace Chemicals
Many potentially toxic chemicals are used and produced in various workplaces. If they are not handled or disposed of properly, they can pose a risk to the environment and human health.

 

Workplace Chemicals
Many potentially toxic chemicals are used and produced in various workplaces. If they are not handled or disposed of properly, they can pose a risk to the environment and human health

Some chemicals, such as polychlorinated biphenyls (PCBs), which are highly toxic, have been banned from use because the risk to human health and the environment was too great. Many other potentially hazardous chemicals are still in daily use in the workplace. It is important to follow instructions on the MSDS for safe handling and disposal of any hazardous material.

 

More research

http://www.osha.gov/SLTC/metalsheavy/index.html

http://www.hc-sc.gc.ca/ewh-semt/contaminants/index-eng.php

 

Assignment One: Local Pollution

Local Pollution

Unfortunately, environmental pollution and contaminants affect every community, even your own, in some way. Research environmental pollutants in the area you live. Based on your research, which of the environmental pollutants in your area do you believe to be the most serious?

In the discussion area BELOW post your opinion on the most serious environmental pollutant in your area and the reasons for your choice. Read your classmates’ ideas and respond to at least two other post.

 

Assignment Two:  Heavy Metals

You will research one of the following six heavy metals:

arsenic
beryllium
cadmium
chromium
lead
mercury

Then record your response to the following questions.  You will put this assignment in the SVN3E courseware—”Heavy Metal”.

1.         Name the heavy metal you chose and describe its physical characteristics.

2.         What is the major source that this heavy metal comes from.

3.         Explain how this metal can enter the body.

4.         Describe any short-term health effects of poisoning by this metal.

5.         Are there any long-term health effects of the metal accumulating in the body?

What can people do to minimize their exposure to this metal and reduce the risk of negative health effects?

Transports, Photosynthesis, Respiration, Enzymes and Environmental Toxins

September 27, 2011 in SBI3C by Jennifer Faulkner

Computer Activity:  Environmental Toxin and Cell Damage

Go to the Ontario Electronic Resource Bank.  You will be reading the content and doing the assignment for this elearning component.  Login with the login and password I give you in class.  Go to the ‘Search 2.0’ and find the ELO1242900.  Complete your assignment and post in the course (I’ll show you where!).

Tablets:  Active and Passive Transport

View the clips on the transport systems (reposted due to mucky first version).  There are several ways cells to get substances in and out of their cells – some do not require energy (passive) and some depend on proteins and energy to achieve this goal (active).

Transport Systems in Cells. from Ms F on Vimeo.

Take notes and draw pictures to help you master the types of transport.  Now… brainstorm ideas of how and what you can demonstrate one of the transport systems.  You will need to create a short movie clip (can film at lunchtime in our room if you need to!!) to demonstrate a transport system.  Be creative and have fun.  If you don’t have a video camera take pictures and do a stop-motion (pixilation) animation!!  Due Tuesday October 11th.  Post in your Blog that I am creating for you.

SmartBoard:  Photosysnthesis and Cellular Respiration

Go to ExploreLearning.com .  You will be completing a Gizmo on ‘Cell Energy Production’.  Use the Usernanm / password:  Group0181 / ant994 to login to class – as a group.  Open a MS-Word worksheet and aswer questions as you click through the Gizmo.

Low Tech: Enzymes and How They Work

Read the pages given 48-55 – take notes where needed.  Do questions 1-4 on page 50 and 55.  Hand in physical copy or post in LiveBinders.

Physical Lab:  Lactase Lab

See pdf version of Prelab (must be done prior to entering the lab!) and Enzyme lab (Procedure and Post Lab questions).  Organize the Prelab questions into an introduction paragraph (or two) with chemical reactions for the enzymes and the post lab questions into a Discussion/Conclusion paragraphs.  Hand in Introduction, Observations and Discussion.  Due Thursday October 6th.

Environmental Toxins and Cell Damage

September 23, 2011 in SBI3C by Jennifer Faulkner

Computer Activity:  Environmental Toxin and Cell Damage Go to the Ontario Electronic Resource Bank.  You will be reading the content and doing the assignment for this elearning component.  Login with the login and password I give you in class.  Go to the ‘Search 2.0’ and find the ELO1242900.  Complete your assignment and post in the courseware – Toxins and Damage.