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Cell specialisation and microscopy Typeit
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Many cells are specialised to allow them to perform their functions. For example, sperm cells and muscle cells have many as they both require a lot of energy, and nerve cells are surrounded by a , which insulates the cell for quick conduction of impulses. In plants, the is used in the transpiration stream to carry from the roots to the leaves, and the side walls in the xylem are strengthened by . Phloem have specialised end walls called for use in .
In order to look at different cells, scientists place a sample on the and look down the of a light microscope. This has a magnification of ×, while the objective lens has lenses at different magnifications, allowing them to see cells at different overall magnifications.