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Heart & Blood Circulation

CONCEPTUAL
Science›The Human Body|Ages 9—11|ID: mt_g_M4Vh_pK7

Describe the circulatory system in detail: the heart has four chambers (two atria, two ventricles) that pump blood in a double loop — one to the lungs for oxygen and one to the rest of the body to deliver it — through arteries, veins, and tiny capillaries

Mastery Evidence

  • Name the four heart chambers and describe the double-loop pathway (heart → lungs → heart → body)
  • Distinguish arteries (carry blood away from heart), veins (carry blood back to heart), and capillaries (tiny vessels where exchange happens)
  • Name the components of blood: red blood cells (carry oxygen), white blood cells (fight infection), platelets (help clotting), plasma (liquid)

Assessment Prompt

“Can [child] trace the path blood takes through the heart and body — explaining that it goes to the lungs first for oxygen, then out to the rest of the body?”

Prerequisites2

Show full prerequisite tree
  • Cells, Tissues & Organs hard

    Understanding 4-chamber heart requires knowing organs work within organ systems

    • The Heart & Blood soft

      Cells-to-systems hierarchy helps organise knowledge of heart as an organ in a system

    • The Brain Controls the Body soft

      Cells-to-systems hierarchy helps organise knowledge of brain as an organ in a system

    • How Breathing Works soft

      Cells-to-systems hierarchy helps organise knowledge of lungs as organs in a system

  • The Heart & Blood hard

    Detailed circulatory system builds on knowing the heart pumps blood through blood vessels

Unlocks2