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Body Lab 3-5 / Week 04 / Wednesday
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Week 04 · Heart and Blood

Wednesday

Roads for blood
// The pump and its delivery roads
⏱ about 15 min

Wednesday: Roads for Blood

Rocket rolls a toy truck across the floor. "Delivery!" he shouts. "Now how does it get home?"

He has built roads going out, but none coming back.

Raven points at the map. "What do you notice? The truck needs a way home."

Nova hovers over the map. "Your blood uses roads too," she says. "Some go out and some come back."

Blood vessels are the roads

Blood moves through tubes called blood vessels.

Arteries carry blood away from the heart.

Veins carry blood back to the heart.

Capillaries are tiny blood vessels. They link arteries and veins together.

Your heart, blood and blood vessels work together as the circulatory system.

  • A trick to remember: Artery and Away both start with A.
  • Veins visit the heart on the way back.
  • Capillaries are the tiny side streets where deliveries happen.
WHICH ROAD?
  • Read the question.
  • Tap your answer.
Which blood vessels carry blood away from the heart?
Which blood vessels carry blood back to the heart?
Which blood vessels are the tiniest?

Around and around

Blood moving through the heart and body is called circulation.

Your heart is fast at this job.

It takes less than one minute to pump blood to every cell in your body.

Blood drops off oxygen and picks up waste. Then it heads back to the heart.

ONE TRIP AROUND THE BODY
  • ?The heart pumps blood into an artery.
  • ?The artery carries blood away from the heart.
  • ?Capillaries drop off oxygen to the cells.
  • ?A vein carries blood back to the heart.
WHY THIS EXERCISEBlood leaves in arteries, delivers in capillaries and returns in veins.
Try it
Make a delivery map on paper.
Put a heart in the middle. Draw red roads going out for arteries.
Draw blue roads coming back for veins.
Draw tiny lines that link them for capillaries.
For a grown-up
Body diagrams often color oxygen-rich blood red and oxygen-poor blood blue.
It is a color code to tell them apart on a picture.
Arteries carry blood ____ from the heart.
Veins carry blood ____ to the heart.
The tiny blood vessels are called ____.
StatementTrue or false?
Blood moves through tubes called blood vessels.?
Veins carry blood away from the heart.?
Blood reaches every cell in less than a minute.?
WHY THIS EXERCISEArteries go away from the heart, and circulation is fast.
What word means blood moving through the heart and body?
WHY THIS EXERCISECirculation is blood moving around and around the body.

Super map making! Tomorrow you learn to feel your heart at work from the outside.

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