Today we looked at the Circulatory System, a basic introduction to the heart, blood and vessels.
After introducing the circulatory Highway and how things flow through arteries, viens and capillaries we discussed what makes up blood which flowed on to the heart.
Where it is located, what does it look like inside, what valves are, what side does what exactly, what makes it pump, where the blood comes in and goes out, why is one side bigger?
Before we got out our heart specimens, we touched on lab procedures and got our gloves on.
We then touched the side of the heart that does all the work pumping blood to the body and noted it was tougher than the other squishy side.
We noted also that the Aorta was strong walled and open and kept it shape. Some cuts were made down the vessels to basically see where they went and we noted the muscular walls inside the heart and some tendons near the valves.
The boys were very interested to see what they could find.
After we cleaned up we watched a great video by School House Rock a song called "Do the Circulation".
I got J to lay down and traced his shape for my circulation Highway diagram.
The large Arteries and Veins are main highways (110km/h), smaller ones city roads ( and capillaries are the small suburban school zone streets (40km/h).
Some worksheets we used included this basic diagram to colour in the blood.
Lolly blood ( red blood cells = mini mms (we had more to start with!, white blood cells = white jellybeans, platelets = 100s and 1000s, plasma is just air in the bag). Good fun for comparing sizes and rough numbers of blood cells.
I used these cut outs to make it easier to remember the role each part of the blood plays, how they move around the circulation highway.
The excavator =White blood cells (remove germs/invaders)
The fuel tanker =Oxygenated blood ( carrying oxygen)
The waste truck =Deoxygenated blood(carries Carbon dioxide/waste products)
First Aid truck = Platelets (rush to the cuts/give first aid)
This is Erythrocyte our red blood cell, he was useful to show blood flow movements around the body and through the different chambers of the heart (I love characters in science lessons!).
Three fresh amazing Lamb's hearts, $2 from Woolies, quite an economical science lab really. Kidneys will be next I think!
Having fun discovering the inside of the heart.
Mostly I used the books we had on the human body to draw circulation diagrams for my displays and there are plenty of websites out there that show how to do a heart dissection and identify parts of the heart.