به انگلیسی

How your blood gets around

Science · Organisms & Life Processes · ages 10-11

Name ______________________ Date ____________

What is the heart's job?
- To break food into nutrients
- To pump blood through vessels
- To move air in and out of lungs
Which of these is a blood vessel that blood flows through?
- An artery
- A rib bone
- A lung
Veins carry blood away from the heart.
Circle one: True False
Why is the circulatory system described as a loop?
- Blood travels from the heart once and then stops moving
- Blood moves only through arteries and never enters veins
- Blood leaves the heart and later returns to it
Which blood vessels have thin walls that let oxygen and nutrients pass from blood into nearby body cells?
- Arteries leading away from the heart
- Veins returning blood toward the heart
- Capillaries beside the body's cells
Follow blood from the heart to the lungs, back to the heart, out to the body, and back to the heart. How many complete loops does this route contain?
Answer: ______________
During a fast bike ride, Idris's muscle cells make extra carbon dioxide. Which shortened route puts its journey to the lungs in the correct order?
- Muscle cells, then body capillaries, then arteries, then the heart, then the lungs
- Muscle cells, then body capillaries, then veins, then the heart, then the lungs
- Muscle cells, then the heart, then veins, then body capillaries, then the lungs
Priya says blood carries oxygen and nothing else. Which statement adds the jobs she has left out?
- Blood also delivers nutrients and carries away carbon dioxide.
- Blood carries only oxygen, while nutrients and waste stay inside body organs.
- Blood carries nutrients and waste, while oxygen stays in the lungs after breathing.

Answer key

For grown-ups. Fold this page away before handing over the rest.

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To pump blood through vessels · The heart is a muscular pump. It pushes blood through vessels, which carry blood around the body.
An artery · Arteries are blood vessels. Ribs and lungs are other body parts, not vessels.
False · Veins carry blood toward the heart. Arteries carry blood away, so the statement is false.
Blood leaves the heart and later returns to it · Blood leaves the heart, travels through the body, and returns to the heart again and again.
Capillaries beside the body's cells · Body capillaries have thin walls where oxygen and nutrients leave blood for cells, and carbon dioxide enters blood.
2 · Heart to lungs to heart is one loop. Heart to body to heart is another, making 2 linked loops.
Muscle cells, then body capillaries, then veins, then the heart, then the lungs · Carbon dioxide enters blood at body capillaries. Veins return this blood to the heart, which pumps it toward the lungs.
Blood also delivers nutrients and carries away carbon dioxide. · Priya names oxygen but leaves out nutrients and waste. Blood delivers nutrients to cells and carries carbon dioxide away from them.