8/15/2023 0 Comments Heart blood flow print![]() Try taking the balloon valve off of the straw and pump water again. This heart model pump shows how one chamber and its valve works.Ī valve is used to keep blood that has been pumped from one chamber to another from flowing back into the chamber it came from. Human hearts have four separate chambers inside. Your heart pumps blood out into your body through your arteries in a similar way. ![]() The cut end of the balloon worked as a valve to stop the water from going back down the straw. You made a simple pump that moved water from the jar through the straws and into the pan. Gently press in the center of the stretched balloon and watch what happens to the water in the jar. Set your pump in a large pan or the sink to catch the pumped water.Slide the uncut end of the balloon neck onto one of the straws and tape it around the straw.The straws should fit securely in the holes so no air can get through around the straws. Stick the long part of the straw into each hole.Make them about an inch apart from each other and near opposite edges of the jar. ![]() Carefully use the tip of a skewer to poke two small holes in the surface of the balloon.The flatter you can get the surface of the balloon, the better. Stretch the balloon over the opening of the jar, pulling it down as tightly as you can.Cut the neck of the balloon off at the part where it starts to widen into a balloon.
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