Grade 4 · Science · Lesson 27

Circulation of blood

Your heart is a powerful muscle that pumps blood around your body all day, every day. Blood carries oxygen and nutrients to every cell and brings waste gases back to be removed. This non-stop journey is called blood circulation, and it follows two connected loops.

What this lesson teaches

1Describe how blood circulates through the heart and body
2Identify the four chambers of the heart and their roles
3Distinguish between pulmonary and systemic circulation
4Name the main blood vessels and explain what they carry

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