Consequently, they are very long and have branches that enable them to connect to other nerve cells. Gland cells, like the cells found in the pancreas, are filled with Golgi apparati. And muscle cells, which must generate large amounts of force, have huge mitochondria and many microfibers. Nerve cells, or neurons, have many long branches to deliver messages quickly. Cell specialization occurs because many forms of life have many levels of organization.
Tissues are groups of cells that carry out a common function.
That's why the factory analogy breaks down as cells become more specialized. Inc. All rights reserved.