Why Do We Need Oxygen? Importance, Uses & Facts

We all breathe all day long. We do it while we are sleeping, eating, and running around the garden. Nobody actually has to tell a newborn baby how to do it; their body just knows. We rarely even notice our own breathing until we catch a nasty cold and our nose gets completely blocked up.

But the invisible stuff we are constantly pulling into our lungs is doing a massive amount of heavy lifting behind the scenes. Without it, the world would basically stop spinning in a matter of minutes. We talk about it all the time, yet most of us do not really know what it does once it enters our chest. Let’s break down the facts about this invisible gas, look at how it keeps us moving, and figure out why kids need to learn about it.

Understanding what is oxygen exactly?

You cannot hold it in your hands, you cannot paint a picture of it, and you definitely cannot taste it on your tongue. If a child asks what is oxygen, the most honest and straightforward answer is that it is a highly active chemical element. On a big science chart in a school laboratory, it sits proudly at number eight.

The most interesting thing about this element is that it absolutely loves making friends. It rarely likes to sit on its own. It constantly pairs up with other elements to create entirely new things. When it teams up with hydrogen, for example, we get the wet water that fills our rivers and oceans. When it binds with iron on an old bicycle left out in the rain, it creates orange rust. It is essentially a busy, invisible building block that forms the basis of almost everything on Earth.

Read More – Lungs for Kids

Spotting the difference between air and oxygen

People often use these two words interchangeably as if they mean the exact same thing. They don’t. There is a very real difference between air and oxygen.

When you step outside in the morning and take a massive gulp of the fresh breeze, you aren’t just breathing in one pure gas. You are actually breathing in a massive cocktail of different things. Think of it like making a fruit smoothie. You don’t just blend a single banana; you add milk, honey, and maybe some berries. The atmosphere is that mixed smoothie.

The actual oxygen in air only accounts for roughly 21 percent of what you are inhaling. So, what is the rest of it? A huge chunk of it is a gas called nitrogen. There are also tiny, extra pinches of carbon dioxide and other random gases floating around. Your lungs are basically incredibly clever filters. They grab the specific gas your body wants from that smoothie mixture, and they quickly throw the useless nitrogen right back out when you exhale.

So, why do we need oxygen?

We eat loads of food to get our energy. A big bowl of warm porridge or a thick slice of buttered toast gives us fuel for the day. But here is the tricky part. Your stomach cannot just turn a piece of toast directly into the energy you need to kick a football across a muddy pitch.

That is exactly why do we need oxygen. It acts as a biological spark plug. A car needs petrol in the tank, but it also needs air to actually burn that petrol and make the engine run. Your body operates in the exact same way. When your food breaks down inside your tiny cells, this gas swoops in to help convert those food bits into pure, usable energy. If that gas wasn’t there to spark the chemical reaction, your breakfast would just sit there doing absolutely nothing, and you wouldn’t be able to move a single muscle in your leg.

Read More – What is Respiration?

The role of oxygen in human body

The journey this gas takes once it gets inside you is pretty wild. The role of oxygen in human body starts the second it travels down your windpipe. It goes straight into your two spongy lungs, which are packed with millions of tiny little air sacs that look a bit like bunches of grapes.

Once the gas reaches these tiny sacs, it slips straight into your flowing blood. This is where your heart takes over.

The heart pumps the blood, acting like a busy delivery depot. Your red blood cells are the delivery drivers. They grab the fresh gas and race around your entire body, dropping it off at every single living cell. Your brain needs a massive, constant amount of it just to keep you awake and thinking straight. Once the cell uses it to burn food for energy, it swaps it for a waste gas called carbon dioxide. The delivery drivers pick up this waste, drive it back to your lungs, and you breathe it out into the room.

Exploring the wider importance of oxygen

This gas does not just keep humans walking around. The overall importance of oxygen stretches across the entire planet, keeping nature in balance. If you are sitting there wondering why is oxygen important besides keeping humans and animals alive, here are a few massive jobs it does out in the wild:

Feeding flames: You literally cannot light a match, cook on a gas stove, or start a warm winter bonfire without it. Flames feed directly on it. If you put a heavy glass jar over a burning candle, the flame will flicker and die the exact second the gas inside runs out.
Underwater life: Fish, crabs, and whales do not breathe empty water. They use their gills to cleverly filter out the tiny amounts of the gas that are trapped and dissolved within the water.
The ozone shield: High up in the sky, a specific type of this gas clumps together to create a massive, invisible shield. It stops the sun’s harsh, burning rays from cooking the earth and damaging our skin.
Medical treatments: In busy hospitals, doctors keep pure, pressurised tanks of it to help sick people or premature babies who are struggling to catch their breath on their own.

Read More – Breathing Exercises for Kids

Conclusion

We just inhale and exhale all day long, never giving it a second thought. Yet, this completely invisible element is the sole reason we can run, think, digest our food, and play. From sparking the raw energy inside our muscles to shielding the whole planet from the burning sun, it works tirelessly in the background. Knowing how our bodies use it makes us appreciate the simple act of taking a deep breath on a crisp, cold morning. It teaches kids that sometimes the most powerful, important things in the world are the ones we cannot even see or hold. To explore more brilliant science topics and secure the perfect learning environment for your child’s early education, read our latest articles on the EuroKids Blog and register their place today through EuroKids Preschool Admission.

FAQs

Where does it all come from?

Trees, green plants, and tiny algae in the ocean make it. They use warm sunlight to make their own food, and they push this fresh gas out into the air as a natural byproduct for us to breathe.

Is breathing 100 percent pure gas safe?

No, it is actually quite dangerous for a healthy person. Our bodies are perfectly built to handle the 21 percent mix found in nature. Breathing the pure stuff for too long can severely damage our lungs.