Hiccups can be really annoying and hard to get rid of, but do you know why they happen? Find out the answer and learn more about how your lungs work at the same time on today's SciShow Kids!

It seems like a good idea to stretch before exercising, but does it actually prevent injuries, or improve your performance?

Hank calls in a friend to do his push ups for him today to explain how skeletal muscles work together to create and reverse movements. Hank and Claire also demonstrate the role size plays in motor units, the three phase cycle of...

Each time you take a step, 200 muscles work in unison to lift your foot, propel it forward, and set it down. It's just one of the many thousands of tasks performed by the muscular system: this network of over 650 muscles covers the body...

Humans’ experiences with ventilators have taught us that sighing isn’t just a way to express yourself: it’s a vital part of our everyday breathing.

The things we eat and drink on a daily basis can impact our health in big ways. Too many carbohydrates, for instance, can lead to insulin resistance, which is a major contributor to cardiovascular disease and Type 2 Diabetes. But what...

Arms and legs are pretty similar, from the amount of bones they have to the way their joints bend, but your legs have one thing your arms don't: kneecaps. Ever wonder why?

People like to say all kinds of things about protein – like, you need to eat lots of it to build muscle and lose weight. The truth is, the science of protein and how your body uses it is much more complicated than that.

Former NFL quarterback Alex Smith almost died after a particularly rough tackle snapped his leg in 2018 -- yet he was back on the field just two years later. In this inspiring talk, he shares his hard-won insights on overcoming fear,...

Metabolism is a complex process that has a lot more going on than personal trainers and commercials might have you believe. Today we are exploring some of its key parts, including vital nutrients -- such as water, vitamins,...

Today Hank wraps up our look at Connective Tissues with a discussion of its various types and a breakdown of what you can and can't easily break down. Also chicken.
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Does your heart rate have an upper limit and could you ever reach it?

Hank takes us on a trip around the body - we follow the circulatory and respiratory systems as they deliver oxygen and remove carbon dioxide from cells, and help make it possible for our bodies to function.

We're kicking off our exploration of muscles with a look at the complex and important relationship between actin and myosin. Your smooth, cardiac, and skeletal muscles create movement by contracting and releasing in a process...

Paul Andersen explains the three types of muscle found in humans; striated, smooth and cardiac muscle. He explains how actin and myosin interact to contract the sarcomere in a muscle. The sliding filament theory explains how ATP and...

Get to know your body’s most important muscle -- your heart -- and learn how to take your own pulse!

Hank tells us about the city of Eukaryopolis - the animal cell that is responsible for all the cool things that happen in our bodies.

During the 4-years of the Khmer Rouge genocide, nearly two million people died, including virtually all of the nation’s doctors. Nearly 30-years later the medical profession is still working to rebuild itself. Among those assisting are a...

Why Do We Hiccup?

Jeff Konchalski was born with spinal meningitis and throughout his childhood he was constantly fighting off illnesses. As a teen, he was often mocked for his inability to play sports and "run with the crowd"… all due to his...

Howcast - Learn how to do a muscle-up or climb-up in this Howcast parkour video with expert Ann Kaczka.

Howcast - Learn how to follow the diet plan known as the Abs Diet in this Howcast video featuring dietician Lisa Moskovitz.

Howcast - Learn how to get ripped from expert Skip La Cour with this Howcast bodybuilding video.

Howcast - Learn how to win bodybuilding contests from expert Skip La Cour with this Howcast bodybuilding video.