Blood moves through our body every moment of our life, even when we are sleeping. This topic is popular because understanding how blood works helps children learn how the body stays alive, active and healthy.
Blood is not just a red liquid — it is a life-support system that carries important things to every part of the body.
What is blood?
Blood is a special liquid inside our body made up of:
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Red blood cells
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White blood cells
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Platelets
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Plasma (the liquid part)
Each part of blood has a different job.
What does blood do?
Blood helps the body by:
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Carrying oxygen from the lungs to all body parts
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Taking nutrients from food to cells
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Removing waste like carbon dioxide
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Fighting germs and infections
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Healing cuts and wounds
Without blood, our organs would stop working.
How blood travels in the body
Blood travels through:
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Arteries – carry blood away from the heart
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Veins – bring blood back to the heart
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Capillaries – tiny vessels that reach every cell
The heart acts like a pump, pushing blood through these vessels again and again.
Why blood is red
Blood is red because of a substance called haemoglobin in red blood cells.
Haemoglobin helps carry oxygen, and it turns bright red when it has oxygen.
How blood helps fight sickness
White blood cells:
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Attack germs
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Protect the body from illness
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Help us recover when we fall sick
Platelets help blood clot when we get a cut, stopping bleeding.
Why kids should care
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Blood keeps the body alive
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Healthy food helps make strong blood
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Learning about blood builds body awareness
Doctors say eating iron-rich foods like leafy vegetables and fruits helps keep blood healthy.
Fun fact
Blood travels around the entire body in less than one minute!
In short: Blood carries oxygen, nutrients and protection to every part of the body.
Learning takeaway: Understanding blood helps children appreciate how the body works together to keep us healthy and strong. ❤️🧠
