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Tiny Cells, One Body

Your body is made of billions of tiny living cells. Each one does its own small job, and together they keep you moving, breathing and thinking.

In the picture

  1. A single cell: one tiny living unit of the body
  2. A knot of cells in the chest: a group beating together as a heart
  3. Cells lined along the arm: a team pulling together as a muscle

Examples

  • Cells in your cheek replace themselves in about a month.
  • Cells in your stomach make acid that breaks down your lunch.

Quiz: Tiny Cells, One Body (Age 10)

  1. What is your body made of?

    • A few very large cells
    • Billions of tiny living cells
    • Only bones and blood
  2. How do cells keep your body working?

    • They work in groups that cooperate
    • They only work while you sleep
    • They each work alone
  3. What does the card teach about the heart?

    • Heart cells never work together
    • A group of cells can beat together as a heart
    • A single cell does every job in the body

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.

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Health, Age 10