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❤️ The Heart and Double Circulation

Look inside the heart's four chambers and trace blood on its double journey, to the lungs for oxygen and out to the body.

2
lessons
~15 min
to learn
🔬 Science
subject
Teens
level
Start the course →

What you’ll learn

  1. The Pump of LifeDescribe the four chambers of the heart, the role of valves, and the difference between arteries and veins.The heart is a four-chambered double pump with two atria that receive blood and two ventricles that pump it out. Valves keep blood flowing one way, arteries carry blood away from the heart at high pressure, and veins return it at low pressure.
  2. Double CirculationExplain double circulation, including how the right side serves the lungs and the left side serves the body.Humans have double circulation: blood passes through the heart twice per trip. The right side pumps oxygen-poor blood to the lungs, and the left side pumps oxygen-rich blood to the body. The left ventricle has a thicker wall because it pumps blood the whole way round the body.

Questions this course answers

What is the main job of the heart?

The heart pumps blood to deliver oxygen and food and remove waste.

What do the valves in the heart do?

Valves keep blood moving one way and prevent backflow.

Which blood vessels carry blood away from the heart?

Arteries carry blood away from the heart under high pressure.

What does double circulation mean?

In double circulation, blood passes through the heart twice per body trip.

Where does the right side of the heart pump blood?

The right side pumps oxygen-poor blood to the lungs.

Why is the wall of the left ventricle thicker than the right?

The left ventricle needs more muscle to pump blood body-wide.

Grounded in trusted sources

  • BBC Bitesize
  • Britannica
  • KidsHealth (Nemours)
  • NHS

Every Wunder lesson is built from real, reputable sources — never invented.

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