Thames & Kosmos Kids First: The Human Body (Version 2) handleiding

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Thames & Kosmos

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DID YOU KNOW?

Your lungs look like a finely

branching tree on the inside.

That turns out to be very

practical, since it creates a

large surface area for gas to

get from the air into your blood

and vice versa. When you

breathe in, oxygen gets from

the air into your body, where

your blood takes it to all your

individual cells. The oxygen is

needed by the cells in order to

produce energy. In the process,

carbon dioxide is produced,

which is a waste product that has to be carried away. The blood takes this

gas into the lungs, where it is breathed back out again.

Trachea

Inhaled air

Lungs

Bonus Experiment:

Use the stethoscope to listen

to your heart sounds. Then

turn over the hourglass and jump around the room until all the

sand has run out — and then listen to your heart with the

stethoscope again. Is the beating faster or slower than before?

Hold the mirror close to your mouth and breathe on it. What

happens? In this experiment, too, you are seeing something

that normally remains hidden from your eyes: your breath.

Because the air you exhale contains water vapor, the mirror

fogs up. In winter, when the air is cold, your breath also turns

visible: When you breathe through your mouth, white clouds

of vapor come out.

Take a Look!

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