Posts Tagged ‘skin’

How is our immune system like a castle?

Monday, September 13th, 2010

Bodiam castle by PhillipC on flickr

Which part of our immune system represents the castle walls?  The small openings or windows?  The moat? The archers in case people get in? 

We’ll begin by talking about our first line of defence – the skin and mucous membranes.  We’ll take a look at their structure and explain how they work to prevent pathogens from entering the body.

These video clips are excellent in explaining how our skin has evolved. Evolve 1Evolve 2.  Evolve 3.

Why don’t we get sick more often?

Friday, September 3rd, 2010

[youtube][/youtube]Here’s a sneak peek at what’s coming up in the next few lessons on the immune system.

Vitamin D, iodine and fibre

Monday, January 11th, 2010
Tikar lady with Goitre by superdove on flickr

Tikar lady with Goitre by superdove on flickr

Three of the nutrients that we need to consume in order to maintain a healthy balanced diet are vitamins, minerals and fibre.  We’ll look at one example of a vitamin (D), one example of a mineral (iodine) and then fibre, and aim to answer the following questions:

  • What are the sources of vitamin D in human diets?
  • What are the risks of vitamin D deficiency from insufficient exposure to sunlight vs the risk of contracting malignant melanoma (skin cancer)?
  • What are the benefits of taking dietary supplements to prevent malnutrition? Use iodine as an example.
  • What is the importance of fibre as a component of a balanced diet?

To get you started, here is a short video clip dealing with vitamin D.  I’ll let you research the others yourselves 🙂

Enjoy and learn!