How Does the Heart Work?

🕐 4 min 32 sec 👦 Ages 6–8 🌍 English
Join Owlo and Koko as they explore how the heart works and why it beats faster when we run. A fun way to learn about our bodies!
Understand how the heart functions Learn why heart rate increases with activity Recognize the heart's role in the body
📖 Story Script
                    Koko:
                    Owlo, Owlo! I ran all the way from the garden to your classroom, and now my chest is going thump, thump, thump super fast!
                
                    Owlo:
                    Welcome, Koko! Come in and catch your breath. That thumping you feel is your heart working hard for you.
                
                    Koko:
                    My heart? Why does it work harder when I run? It was totally fine when I was just watering the flowers.
                
                    Owlo:
                    That is such a wonderful thing to notice, Koko. Your body needed more energy to run, so your heart had to speed up.
                
                    Koko:
                    But what does my heart actually do? Is it just in there making noise?
                
                    Owlo:
                    Your heart does so much more than make noise. It is a pump, and its job is to send blood all around your body.
                
                    Koko:
                    A pump? Like the one we use to fill up the ball in the gym?
                
                    Owlo:
                    Exactly like that! A pump pushes something from one place to another. Your heart pushes blood through your whole body, every single second.
                
                    Koko:
                    Every second? Even when I am sleeping?
                
                    Owlo:
                    Every second, even when you are sleeping, even when you are dreaming about adventures. It never takes a break.
                
                    Koko:
                    That is incredible. But why does blood even need to go everywhere?
                
                    Owlo:
                    Great question. Blood carries oxygen and food energy to every part of your body. Your muscles, your brain, your fingers — they all need it to work.
                
                    Koko:
                    So my brain needs blood to think, and my legs need blood to run?
                
                    Owlo:
                    Exactly right. Without blood reaching them, they simply could not do their jobs. Your heart makes sure everyone gets what they need.
                
                    Koko:
                    I want to see how it works. Can we look something up in the science lab?
                
                    Owlo:
                    I was thinking the very same thing. Let us head over there right now.
                
                    Owlo:
                    Here we are. I have a model of the heart right here on the table. Take a good look at it, Koko.
                
                    Koko:
                    Whoa, it has different sections inside! It looks a little like two rooms on each side.
                
                    Owlo:
                    You are very observant. The heart has four chambers, which is just a fancy word for rooms. Two on the left, and two on the right.
                
                    Koko:
                    So what do the different rooms do?
                
                    Owlo:
                    The right side receives blood that has already travelled around the body, and sends it to the lungs to pick up fresh oxygen.
                
                    Koko:
                    And then the blood comes back with the oxygen?
                
                    Owlo:
                    It does! The blood returns to the left side of the heart, and then the left side pumps it out powerfully to the whole body.
                
                    Koko:
                    So the heart is like a two-part delivery system. One side sends blood to the lungs, and the other sends it everywhere else.
                
                    Owlo:
                    That is one of the best descriptions I have ever heard, Koko. A two-part delivery system is absolutely perfect.
                
                    Koko:
                    And I can feel it beating. Is that the pumping?
                
                    Owlo:
                    Yes! Each beat is the heart squeezing to push blood forward. A healthy heart beats around seventy to one hundred times every minute.
                
                    Koko:
                    That is so many times. My heart must be really strong then.
                
                    Owlo:
                    It is a muscle, just like the ones in your arms and legs. And just like those muscles, it gets stronger when you move and play.
                
                    Koko:
                    So running in the garden is actually good for my heart?
                
                    Owlo:
                    Running, dancing, swimming, playing — all of it helps your heart stay healthy and strong. Your heart loves it when you are active.
                
                    Koko:
                    I am going to run in the garden every single day then. My heart deserves it.
                
                    Owlo:
                    I love that attitude. Now, before you head back out, can you tell me what you learned today about how the heart works?
                
                    Koko:
                    Okay! So the heart is a pump that sends blood all around the body, every single second, even when we sleep.
                
                    Koko:
                    It has four rooms inside. One side sends blood to the lungs to get oxygen, and the other side sends the blood out to the whole body.
                
                    Koko:
                    Blood carries oxygen and energy to our muscles and brain so they can work. And when we run and play, our heart beats faster because our body needs more energy.
                
                    Koko:
                    Oh, and the heart is a muscle too, so the more we move, the stronger it gets. Next time I want to learn about the lungs, because they seem like the heart's best friend!
                
                    Owlo:
                    That is a perfect summary, Koko. And yes, the lungs and the heart are the greatest team in your whole body. Now go enjoy that garden!