- Top left box: Lungs (site of gas exchange; blood picks up oxygen and releases carbon dioxide).
- Top right box: Pulmonary arteries (carry deoxygenated blood from the heart to the lungs).
- Middle left box: Right atrium (receives deoxygenated blood from the body via the vena cava).
- Middle right box: Left atrium (receives oxygenated blood from the lungs via the pulmonary veins).
- Bottom left box: Right ventricle (pumps deoxygenated blood to the lungs through the pulmonary arteries).
- Bottom right box: Left ventricle (pumps oxygenated blood to the rest of the body through the aorta).
Extension:
Colour code: Use red for oxygenated blood and blue for deoxygenated blood.
Explanation: The colours don’t show which specific blood vessels are which because both types of blood flow through different vessels depending on their location in the circuit. For example, pulmonary arteries carry deoxygenated blood (blue), while pulmonary veins carry oxygenated blood (red). Systemic arteries carry oxygenated blood (red), and systemic veins carry deoxygenated blood (blue). The colour indicates the blood’s oxygen content, not the vessel type.
Parent Tip: Review the logic above to help your child master the concept of circulatory system labeling worksheet.
