REPUBLIC OF THE PHILIPPINES Department of Education Region III – Central Luzon Schools Division of Zambales SAN GUILLERMO NATIONAL HIGH SCHOOL Activity 5 Pump It! Objectives: Describe how the heart functions Build a working heart model Explain how blood is pumped by the heart Materials 3 x Pop bottles (710 mL) with caps, labels removed. 4 x Bendy straws 3 Cups of water Food colouring (RED) Tape Modeling clay Scissors (or other sharp pokey for making holes in the caps) Reference/s: www.steampoweredfamily.com/activities/heart-model-heart-stem , Science 9 LM A. PROCEDURES ( FOR HEART MODEL) 1.You will need 2 bottle caps for this experiment. Keep the third one as a back up. In the first cap drill two holes that are the same size. You want the holes to be just big enough for the straws to slide through. In the second cap drill one hole that is straw sized. The second hold should be smaller. If you drill both straw sized (like we did), you can use some modeling clay to make the second hole a little smaller. 2. In a pitcher mix your water and food colouring to create your red blood. The exact amount of water is not important. 3.Take two straws, stretch and bend them to create a 90 degree angle. Slide one straw into the other straw (pinch one to make it smaller so it slides in), then tape up the join. Repeat with the second set of straws. San Guillermo National High School Address: Burgos, San Marcelino, Zambales Email Address: 301029@deped.gov.ph REPUBLIC OF THE PHILIPPINES Department of Education Region III – Central Luzon Schools Division of Zambales SAN GUILLERMO NATIONAL HIGH SCHOOL 4. Place your three bottles on the table. Fill the first two with your water to about 80% full. Leave the third one empty. 5. On the first bottle place the cap with one straw hole and one small hole. On the middle bottle place the cap with two straw holes. Leave the third bottle without a cap. 6. Carefully slide the straws through the bottle caps. Place clay or play dough around the straw bases on the middle bottle to make an airtight seal with the bottle cap. You are now ready to put your heart model to work. 7. Refer to the photo below to know what your setup must look like. Figure 10. The working heart model B. PROCEDURES (MAKING YOUR HEART MODEL WORK) 1. In this simple model the first bottle is the atrium of the heart, the second bottle is the ventricle, and the third bottle represents either the lungs or body. Our fingers function as the valves of the heart. 2. To make your heart model work, squeeze the middle bottle only. Start by pinching the straw between the atrium and ventricle bottle. Squeeze the middle bottle and watch your “blood” squirt out into the body. San Guillermo National High School Address: Burgos, San Marcelino, Zambales Email Address: 301029@deped.gov.ph REPUBLIC OF THE PHILIPPINES Department of Education Region III – Central Luzon Schools Division of Zambales SAN GUILLERMO NATIONAL HIGH SCHOOL 3. Repeat, repeat, repeat to pump blood from the atrium, into the ventricle then out to the body! 4. Once your blood in the atrium gets too low, you can take blood from the “body” and add it back into the atrium. Then start again. Guide Questions: Q16. What does the water inside the soda bottle represent? ______________________________________________________________________ Q17. How will you compare the working heart model and the human heart? ______________________________________________________________________ Q18. How does the heart function as a pump? ______________________________________________________________________ Q19. Will the heart model be able to function properly if the straw is blocked? Explain your answer. ___________________________________________________________________ KEY CONCEPTS The heart is a hollow muscular organ, about the size of your fist, which is located in the center of your chest between the lungs. It is a double pump that pumps on the left and right sides. Every side is divided into two chambers, the atrium and the ventricle, each of which has left and right portion, totaling to four chambers altogether. The top chamber is the atrium (plural: atria). The bottom chamber is called the ventricle. The valve acts as a one way door, allowing blood to flow either forward into the next chamber, or out of the heart. Prepared by: CHARILYN D. DELA CRUZ Science 9 Teacher San Guillermo National High School Address: Burgos, San Marcelino, Zambales Email Address: 301029@deped.gov.ph
