Showing 5 posts tagged blood
This week, the 5 year old discovered the science videos of Bite Sci-zed’s Alex Dainis, starting with this one: Echinoderm Show & Tell. When he immediately asked for more, we watched The Gas Laws, Dishes and Membranes and Why Red Blood Cells Look Like Donuts, above.
We’ve talked about red blood cells (and white blood cells) before, so some of this sounded familiar. And while some information is targeted towards older kids, the use of everyday objects and drawings provided enough familiarity to start our conversation…
And the next time you have a donut, you’ll know how to make a red blood cell. Go forth, do science.
The digestive system! What happens to your food while you’re chewing it, when you swallow it, when it’s in your stomach? How does all of the digested nutrients travel around your body? (Hint.) And where does it go after that??? (Hint.)
Related watching: the circulatory system.
The circulatory system consisting of the heart, arteries, capillaries, and veins, is the pumping mechanism that transports blood throughout the body. In the heart, the left ventricle contracts, pushing red blood cells into the aorta, the body’s largest artery. From here, blood moves through a series of increasingly smaller arteries, until it reaches a capillary, the junction between arteries and veins. Here oxygen molecules detach from the red blood cells and slip across the capillary wall into body tissue.
Now de-oxygenated, blood begins its return to the heart. It passes through increasingly larger veins to eventually reach the right atrium. It enters the right ventricle, which pumps it through the pulmonary arteries into the lungs, to pick up more oxygen. Oxygenated, blood reenters the left atrium, moves into the left ventricle, and the blood’s journey begins again.
Nothing like riding through the body to get the point across!