Click any organ or structure on the map to learn about its role — plus a fun fact you won't forget!
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The Immune System
🔬 Role in the Immune System
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Connected System
Circulatory System
The circulatory system is the immune system's rapid transit network — white blood cells and antibodies travel through blood vessels to reach any infection site in the body within minutes.
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Connected System
Skeletal System
All immune cells originate in bone marrow. Every B-cell, T-cell, and macrophage begins as a stem cell in the red marrow of large bones — the skeletal system is the immune system's manufacturing plant.
2 trillionWhite blood cells in your body
~600Lymph nodes throughout the body
1B+Antibody types your body can make
120 daysMemory cell lifespan (some: lifetime)
3Systems it connects to
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Connection Quiz
Toggle each system pill above — all 5 questions come from the connected system cards and node information.
Progress0 of 5 answered
Circulatory Connection
The Circulatory connection calls blood vessels the immune system's "rapid transit network." How quickly can white blood cells and antibodies reach an infection site?
Skeletal Connection
The Skeletal connection reveals where every immune cell originates. What is the birthplace of B-cells, T-cells, and macrophages?
Thymus Node
The Thymus node explains what T-cells do when they arrive at the thymus. Where do they come from, and what do they become?
Spleen Node
The Spleen node lists three jobs of the spleen. Which option correctly captures all three?
Antibodies Node
The Antibodies node describes their shape and what makes each antibody unique. What is true about antibody specificity?
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Report Card
Answer all 5 questions to unlock your report card.