The Science of You: How Your Heart & Circulation Work ❤️

Sleep Tight Science - A Bedtime Science Podcast For Kids

Sleep Tight Media

Kids & Family, Education For Kids

4.4 • 739 Ratings

🗓️ 11 February 2026

⏱️ 25 minutes

🔗️ Recording | iTunes | RSS

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Summary

In this episode we are going to try and answer the following questions: How does your heart work—and how does blood travel through your whole body and back again? We'll start with what your heart is and how it pumps, then, we'll follow the journey blood takes through your body, finally, we'll explore why your heart speeds up and slows down, and what you can notice about your own heartbeat. Grown-ups: we value your feedback. Our email and message link are in the episode notes—please send us your child’s questions and thoughts. Sleep Tight!, Sheryl & Clark ❤️👂📖 --- ✨ Want more stories and fewer interruptions? Join Sleep Tight Premium for ad-free listening, bonus bedtime stories every week, and personalized shout-outs for your little ones! Start your free trial now on Apple Podcasts or at ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠sleeptightpremium.com⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠. --- Support Us 👉 Join ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Premium⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ for AD FREE listening and extra bedtime stories! 👉 ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠Sleep Tight Premium⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ is now available in Apple Podcasts! 🎉 ⭐⭐⭐⭐ Leave a review wherever you listen to podcasts, or share our podcast with your friends. 📢 Have an interesting science topic you would like to investigate? Send us an email at ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠hello@sleeptightscience.com⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ , and we may feature it in an upcoming show. --- About Sleep Tight Science We’ve got bedtime down to a (Sleep Tight) Science! Sleep Tight Science is an award winning bedtime podcast that makes science accessible and enjoyable for the whole family. Snuggle in and drift off to sleep while learning about science topics submitted by listeners! Designed for curious young minds (but simple enough for grown-ups to understand), Sleep Tight Science uses big words to answer big questions that kids wonder about, like why do we feel icky sometimes and how do our legs help us move? Learn something new about the natural world while drifting off to dreamland. Have an interesting science question or a topic you’re curious about? Email us at ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠hello@sleeptightscience.com⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠, and it might just be the focus of an upcoming episode! Dedicated to enhancing the health and happiness of children, Sleep Tight Media helps families replace bedtime struggles with bedtime snuggles. -- Advertising provided by Starglow Media. Learn more about Starglow Media ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠here

Transcript

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0:00.0	You are listening to Sleep Tight Science.
0:17.1	Did you know that right now, while you're sitting still and listening, your heart is beating
0:24.6	about once every second. And it's been doing that since before you were born? What?
0:36.6	Hello, friends, and welcome back to Sleep Tight Science, a bedtime show that answers your questions about science.
0:46.6	You might be seeing hearts on cards and decorations everywhere right now.
0:53.8	Heart shapes on valentines, heart stickers, heart candies.
0:59.3	But the real heart inside your chest is doing something way more amazing than any drawing could
1:06.8	show.
1:08.3	It's a pump that beats about a hundred000 times a day, pushing blood through thousands
1:16.0	of miles of tubes in your body, delivering oxygen to every single cell that needs it. And it does
1:24.9	all of this without you ever having to think about it.
1:30.7	In this episode, we are going to try and answer the following questions.
1:36.7	How does your heart work?
1:39.2	And how does blood travel through your whole body and back again?
1:45.1	We'll start with what your heart is and how it pumps.
1:49.9	Four chambers, valves that open and close, and the rhythm that never stops.
1:56.5	Then we'll follow the journey blood takes through your body.
2:00.8	One loop to your lungs to pick up oxygen, another loop out to your body to deliver it.
2:08.4	Finally, we'll explore why your heart speeds up and slows down,
2:13.6	and what you can notice about your own heartbeat.
2:18.7	You don't have to remember every word.
2:22.5	Try to remember this.
	...

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