The human body activities

Inside your body

Follow blood, breath and food, then explore filtration and support.

1. 1

   Where does blood travel next?

   Where does blood go after the right side of the heart? Follow the gold marker. The right side sends blood to the lungs; the left side sends it to the body.

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2. 2

   How do gases cross between air and blood?

   Do oxygen and carbon dioxide cross the same way? Compare the same thin surface for the two gases. The sac contains air; the vessel contains blood.

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3. 3

   How does food become nutrients the body can use?

   Does absorbed food stay inside the gut tube? Follow food through the tube, then switch to a nutrient leaving the small intestine.

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4. 4

   What stays in blood, and what becomes urine?

   Does everything filtered by a kidney become urine? Compare a small glucose molecule with a blood cell. Watch which route each follows.

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5. 5

   How can bones support and protect the body?

   Are bones just solid sticks? Choose a bone and inspect its outer layer, spongy network and marrow. The cutaway is a picture to explore.

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Movement and messages

Connect movement, sensory signals, immune response and DNA information.

1. 1

   Why do different joints allow different movements?

   Can an elbow-like hinge move sideways? Compare a hinge with a ball-and-socket joint in the same direction. A blocked movement is an outcome, not a broken animation.

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2. 2

   How can a pair of muscles move a joint both ways?

   Do muscles pull or push the bones? Compare bending with straightening. Follow the highlighted muscle and its tendon across the joint.

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3. 3

   How does a stimulus become information?

   Does a picture travel down an eye nerve? Follow a stimulus to a receptor, then a nerve signal to processing in the brain or spinal cord.

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4. 4

   How do different defences work together?

   Does immune memory recognize every new microbe? Compare a first encounter with a repeat of the matching feature M. The stages are a conceptual map, not an illness clock.

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5. 5

   How does DNA pairing help preserve information?

   Which letter belongs across each DNA rung? Read across a rung: A pairs with T, and C pairs with G. The two strands run in opposite directions.

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Keep exploring

Read more in Life Science encyclopedia articles, with reading controls on each article. For printable practice, explore Maths worksheets and answer guides.