Introduction & Blood Vessels
1. Pray. Read & discuss Psalm 51: 10, 17.
2. Review systems of the body. Introduce circulatory system.
3. Ask children to name to name the parts of the body that are involved in pumping blood. Can they see those parts without cutting open their bodies? Yes! Have children look at each others' eyes to see capillaries (easily seen in blood-shot eyes), or they can look at their own if they have mirrors. Have them see the capillaries in their own eyelids by closing their eyes and then looking at a bright light. Blood flows from capillaries to veins. Children can see their veins by looking at their wrists and hands. The blue lines are their veins with blood returning to the lungs. Why is it blue? Because its depleted its supply of oxygen. The blood isn't actually blue. It is dark red. The dark red color looks blue under our skin. After the blood has returned to the heart and lungs to get more oxygen, it goes throughout the body in the arteries. The blood is bright red/ Children can see their arteries under their tongues. Have them look at the tongue of a neighbor or look at their own tongues using compact mirrors. The red lines are arteries. What else can they see? They should also be able to see blue lines which are veins and thin, red lines which are capillaries.
YOU WILL NEED: mirrors (such as compact mirrors) (optional)
Original article and pictures take http://iijuan12.hubpages.com/hub/learning-about-the-circulatory-system site