Human Body Systems

Subject: Science  ·  Grade level: 5th

Tour the circulatory, respiratory, digestive, and nervous systems. Your body has trillions of cells, all organized into tissues, organs, and systems that quie

In this lesson

• Circulatory system — your delivery network
• Respiratory system — bringing in oxygen
• Digestive system — turning food into fuel
• Nervous system — your body's command center
• Systems working together

Key terms

Heart

A muscle that pumps blood.

Artery

Vessel that carries blood away from the heart.

Vein

Vessel that returns blood to the heart.

Human Body Systems lesson on BrightPath

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