Tonsil tissue, light micrograph

Tonsil tissue, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Tonsil tissue. Light micrograph of a transverse section through tissue from a tonsil. The tonsils, part of the immune system, are large lymphatic nodules in a mucous membrane. They are arranged in a ring at the back of the throat. Each tonsil has a stratified squamous epithelium lining (outer layer) and lymphoid follicles (round, purple) with germinal areas. The tonsils contain B and T lymphocytes and macrophages, but when overloaded with viruses and bacteria they cannot cope and they have to be removed in an operation called a tonsillectomy. Magnification: x13 when printed 10 centimetres tall.

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Keywords: anatomical, anatomy, b-lymphocytes, biological, biology, close-up, cross-section, detail, healthy, histological, histology, human body, immune system, immunological, immunology, light micrograph, light microscope, lm, lymphatic system, lymphatic tissue, lymphocytes, lymphoid system, macrophages, node, nodule, normal, section, sectioned, stratified squamous epithelium, t-lymphocytes, tissue, tonsil, tonsils, transverse section, white background, white blood cells

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