Composition and functions of blood
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Simple epithelial tissue
Squamous tissues develop in places where they do not hinder transport, e.g. line blood vessels or lungs (pulmonary alveoluses). That tissue contribute to renal capsules in kidneys. Cells of that tissue are flattened and thin, their nuclei are in the centre. Squamous epithelial tissue is adapted to taking part in gas exchange.
Nucleus in the centre
where they do not hinder transport
line pulmonary alveoluses
line vascular system
Cells of that tissue look like cubes, are much thicker than cells of simple squamous epithelial tissue (above). But like them they have nucleus placed in the cell centre. They can be found in nervous canaliculuses, final sections of glands. In cells of cuboidal tissue intensive absorption and secretion takes place.
Nucelus in the centre
Intensive absorption and secretion
Simple cylindrical epithelial tissues can be found mainly in fallopian tubes, alimentary canal and small intenstine. Cells developing in fallopian tubes have cilia that make movements in uterus easier, and those developing in small intenstine contain microvilli that enlarge absorption surface. Cells of that tissue are prism-shaped. Nucelus is at the cell bottom.
Nucelus at the bottom
they have cilia that make movements easier
Simple pseudo-stratified epithelial tissue can be confused with stratified tissues, because they have nuclei situated at different heights. Cells are tall, bent prisms. On the surface they often have numerous cilia that remove pollutants. It can be found in respiratory system – nasal cavity, larynx, trachea and bronchial tubes.
Impression of multi-layered structure