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The Human Body
Explainers in The Human Body
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The Human Body
Your eyes
How the eye focuses light onto the retina, how rods and cones work, how we see colour, and what colour…
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The Human Body
Your ears
How the ear turns air vibrations into sound through the eardrum, three tiny bones and the cochlea, and how…
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The Human Body
Sleep
What happens during sleep, how the sleep stages and body clock work, why the brain stays active at night and…
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The Human Body
Your lungs
How the lungs move oxygen into the blood and carbon dioxide out, what the diaphragm does, and why carbon…
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The Human Body
Your blood
What blood is made of, what red cells, white cells, platelets and plasma do, why blood looks blue in veins…
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The Human Body
Your immune system
How the immune system fights infection with barriers, fast defences and memory, why a fever happens and how a…
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The Human Body
Digestion
How food is broken down from mouth to stomach to gut, how nutrients reach your blood, how long it takes and…
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The Human Body
Your muscles
How muscles contract by sliding fibres, why they work in pairs, the three types of muscle in the body and…
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The Human Body
How signals travel
How nerve cells carry electrical signals, how messages jump between cells, why reflexes are so fast and what…
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The Human Body
Your kidneys
How the kidneys filter blood, keep what the body needs, produce urine and control water and salt balance, and…
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The Human Body
Your skin
What your skin is made of, how it protects you, cools you and senses touch, how it replaces itself and how a…
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The Human Body
Your bones
What bones are made of, how living bone is constantly renewed, how a broken bone heals in stages and why a…
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The Human Body
Your heart
How the heart's four chambers and valves pump blood to the lungs and body, what makes it beat, what the…