This past week my whole family has been fighting a nasty cold/virus that turned into pneumonia. I thought this was a good time to discuss our body's defense mechanisms and specifically talk a little bit about blood. Plus, its getting closer to Halloween and I thought it might be helpful to also discuss real vs. pretend in case the kids accidentally see something frightening like a blood thirsty vampire. So our science Sunday fun revolved around blood today - real and fake.
My daughter has already learned a little about anatomy in her health class including the basics about her heart. We expanded a little on this and studied a diagram of the circulation system and blood vessels. Texas Heart Institute has a wonderful online website, Project Heart, that includes pdf diagrams for kids of all things related to the circulatory system. http://www.texasheart.org/hic/projH/circulatorysystem.cfm
We learned about the make up of blood and especially concentrated on white blood cells because they help fight infection.
- Red Blood Cells: carry hemoglobin that delivers oxygen
- White Blood Cells: fight infection
- Platelets: help blood clot
- Plasma: yellowish liquid that carries the blood cells, nutrients and waste
We viewed this neat image showing the above components:
And, we watched this animated gif showing the blood circulate:
After learning all about blood we made some fake blood using a recipe we found in The Worst Case Scenario Survival Handbook: Gross Junior Edition. While this recipe is not available online, several Fake Blood Recipes can be found at Steve Spangler Science.
Materials we used: Mug, cocoa powder, warm water, corn syrup, red food coloring, old cotton t-shirt
While my kids thought it was fun to mix up all the ingredients and stir the fake blood, they didn't want to touch it at all or taste it (it's edible). We all expected the concoction to look more red. Our mixture had a really muddy brown color in the mug and didn't look like blood at all until we took it out of the mug and put some on our cotton cloth. The kids also commented that the fake blood smelled like chocolate Pop Tarts - it really does! We talked about the differences between fake blood and real blood and talked about instances when people might use fake blood. If my kids were older, I'd probably talk a little about blood types or try out some of the other recipes to see which looks the most realistic. Our recipe made way more blood than we needed, so I'd recommend halving most recipes unless you have a need for a ton of fake blood. They really enjoyed this simple and easy to conduct kitchen science experiment.
This week we hope to check out a Let's-Read-and-Find-Out Science book called A Drop of Blood by Paul Showers, illustrated by Edward Miller from the library. It looks like an informative and fascinating science book for kids and the cover art is perfect for the upcoming Halloween weekend.
Kid's Health: What's Blood
Idaho Public Television - Blood
For older kids:
Scholastic About Blood
PBS Red Gold
If you enjoyed this post you can find more Science Sunday experiments involving kids at http://adventuresofmommyness.blogspot.com/2010/10/science-sunday-why-do-water-striders.html or even join in the weekly meme. Science is Fun!