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.
Cell - the structural unit of plants. Cytology - the study of cells concerning their organization, structure, and function. Plant cells vary in shape and measure between 0.025 mm and 0.25 mm (24 -250 ) in size. Some cells (long tubular fibers) are as much as 2 feet long. Cytoplasm (protoplasm) - all the living unit of a protoplast outside the nucleus in the cell.