HB-050 · Cardiovascular · Assembly

Blood flow pathway

Also called: double circulation Circulatio sanguinis

Schematic 3D Classes 6-8 · Classes 9-10 · Classes 11-12 Intermediate Draft - educator review

3D is not available on this device, so a picture of the model is shown instead.

Parts: body; vena cava; right heart; lungs; left heart; aorta; body

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About

Blood flows in two loops: the pulmonary loop through the lungs and the systemic loop through the body.

📍 Where it is: Heart, lungs and the whole body.
🧱 Structure: Right heart -> pulmonary arteries -> lungs -> pulmonary veins -> left heart -> aorta -> body -> venae cavae -> right heart.
⚙️ What it does: Picks up oxygen in the lungs and delivers it to body tissues while removing carbon dioxide.

💡 Key facts

Blood passes through the heart twice in one complete circuit.
William Harvey described circulation in 1628.
One full circuit takes about a minute at rest.

✗ Blood goes from the heart to the body and back to the lungs

✓ Body blood returns to the right heart first, then goes to the lungs.

📒 Words to know

pulmonary circulation: heart-lungs-heart loop
systemic circulation: heart-body-heart loop
double circulation: two loops through the heart

🏫 Related lessons

Animals: life processes and reproduction Classes 6-8
Life processes Classes 9-10
Physical fitness and assessment Classes 9-10

Generic GayaGnan topic lessons. Check your own board's syllabus for the exact chapter.

🔎 Sources and credits

Catalog description: Animated pulmonary and systemic circulation.

OpenStax Anatomy and Physiology 2e, ch. 18-20 (blood, heart, vessels) (accessed 2026-10-30)
3D models: BodyParts3D (DBCLS) and the Human Reference Atlas (HuBMAP), CC BY 4.0, with GayaGnan schematics. 3D model credits

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