O2 CO2 SKIT
1. Distribute the labels, one to each student in the class. Students wear the labels.
2. Have the students arrange themselves in a circle, according to their label, in an order that represents the flow of blood through the circulatory system. Refer to posters and diagrams as necessary.
3. Give the white foam discs (representing oxygen) to the students representing the lungs. Give the blue foam discs (representing carbon dioxide) to the students representing the body cells.
4. Talk through the journey of one plate. Have each student say the part that he/she represents as the "blood" moves through it. Ask where the oxygen comes from, and where it goes.
5. Start passing several plates through the system. As the plates go through the lungs, those students attach white foam discs to the plates. As the plates go through the capillaries, the body cells take off the white discs (oxygen) and attach blue discs (carbon dioxide) to the plates.
6. Explain that this is not a perfect model. In the human heart, for instance, the pulmonary artery branches off in two directions (one to each lung). Here we have only one artery leading to one capillary leading to one vein. In the human body, the arteries branch off ever smaller until they get to the network of capillaries.
Notes to the teacher: Oxygen Exchange
In addition to oxygen, blood also carries nutrients to the body cells. The villi, tiny finger-like parts lining the small intestine, absorb nutrients from digested food. Blood picks up the nutrients from the villi. Eventually, the body cells absorb the nutrients out of the blood. To get energy, the body's cells use oxygen to "burn" certain nutrients. This produces energy and a waste product: carbon dioxide. Along with oxygen and nutrients, blood carries hormones and antibodies to different parts of the body.
Blood consists of blood cells, platelets, and plasma. Red blood cells are responsible for carrying oxygen to the rest of the body. White blood cells help to fight infection. Platelets help your blood to clot when you get a cut. Plasma consists of water and many dissolved substances (such as proteins and salts) required by the body.
Lab #5 Blood
Blood Circulation Lab
| lesson 1: Pulse of Life| lesson 2: Keeps on Pumpin' | lesson 3: Under Pressure | lesson 4: Sounds of the Heart | lesson 4a: Valves and Pumps | lesson 5: Lub Dub (valves) | lesson 5a: The Heart as a Pump | lesson 6: Go With the Flow | lesson 7: Lung Model | lesson 8: Ins and Outs of Respiration | lesson 9: Catch Your Breath | lesson 10: O2 CO2 Skit | lesson 11: X-Rays |
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