Cells are the smallest units or building blocks of all living things. There are many structures to the cell: the nucleus, the cytoplasm and many other organelles. Cells vary in size, shape, and function, thus creating cell diversity. Passive transport processes and active transport processes occur throughout the cell membrane. Cell division is a process of which a cell reproduces itself. It starts out with DNA replication. Interphase, prophase, metaphase, anaphase, and telophase and cytokinesis. RNA and DNA play significant roles in carrying out functions of the cell as well. Groups of cells that are similar in structure and function are called tissues. The four types of tissue are epithelium, connective tissue, nervous tissue, and muscle. The classifications by cell arrangement are simple epithelium and stratified epithelium which can further be grouped as squamous, cuboidal, or columnar. The types of connective tissue are: bone, hyaline cartilage, fibrocartilage, dense fibrous, areolar, adipose, reticular, and blood. The three types of muscle tissue are: skeletal, cardiac, and smooth. Regeneration is the replacement of destroyed tissue by the same kind of cells and fibrosis involves repair by dense connective tissue.
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