Tissue (biology)
![Cross section of sclerenchyma fibers in plant ground tissue](/Images/godic/202501/26/Plant_cell_type_sclerenchyma_fibers1306.png")
![Microscopic view of a histologic specimen of human lung tissue stained with hematoxylin and eosin.](/Images/godic/202501/26/Emphysema_H_and_E1306.jpg")
![PAS diastase showing the fungus Histoplasma.](/Images/godic/202501/26/Histoplasma_pas-d_small1306.jpg")
![Cross-section of a flax plant stem with several layers of different tissue types:
1. Pith,
2. Protoxylem,
3. Xylem I,
4. Phloem I,
5. Sclerenchyma (bast fibre),
6. Cortex,
7. Epidermis](/Images/godic/202501/26/Stem-histology-cross-section-tag.svg1306.png")
In biology, tissue is a cellular organizational level intermediate between cells and a complete organ. A tissue is an ensemble of similar cells from the same origin that together carry out a specific function. Organs are then formed by the functional grouping together of multiple tissues.