AHIMA offers two levels of certification: the entry-level Certified Coding Associate (CCA) and the mastery-level Certified Coding Specialist (CCS). A high school diploma or equivalent is needed for the CCA certificate.
1833: English Botanist Robert Brown discovered the nucleus in plant cells. 1838: Matthias Jakob Schleiden, a German botanist, concluded that all plant tissues are composed of cells and that an embryonic plant arose from a single cell. He declared that the cell is the basic building block of all plant matter. This statement of Schleiden was the first generalizations concerning cells.
Plant cells are of three basic types namely, parenchyma, collenchyma and sclerenchyma. These cells have different structures and perform varied roles in the overall functioning of the plant. The following is a brief description of functions of these three plant cells: