OpenLearn Create will be unavailable on Tuesday 23 June 2026 from 8am to 11am (GMT) due to routine maintenance.
OpenLearn Create will be unavailable on Tuesday 23 June 2026 from 8am to 11am (GMT) due to routine maintenance.
OpenLearn Create will be unavailable on Tuesday 23 June 2026 from 8am to 11am (GMT) due to routine maintenance.
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Communicable Diseases
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Figure 20.3 The sites in the body (in addition to the blood) where cells of the human immune system are concentrated. (Source: The Open University, SXR376 Preparatory Reading, Figure 1.2, page 7)
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