Mature human nerve cells and muscle cells

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In unicellular organisms, cell division is the means of reproduction; in multicellular organisms, it is the means of tissue growth and maintenance. Survival of the eukaryotes depends upon interactions between many cell types, and it is essential that a balanced distribution of types be maintained. This is achieved by the highly regulated process of cell proliferation. The growth and division of different cell populations are regulated in different ways, but the basic mechanisms are similar throughout multicellular organisms.
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Lab-grown nerve cells make heart cells throb

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Cell - Cell division and growth |

NCBI Bookshelf. Molecular Cell Biology. New York: W. Freeman; A cell in an adult organism can be viewed as a steady-state system.
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6.2 The Cell Cycle

The cell cycle is an ordered series of events involving cell growth and cell division that produces two new daughter cells. Cells on the path to cell division proceed through a series of precisely timed and carefully regulated stages of growth, DNA replication, and division that produce two genetically identical cells. The cell cycle has two major phases: interphase and the mitotic phase Figure 6.
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Researchers at Johns Hopkins report that a type of lab-grown human nerve cells can partner with heart muscle cells to stimulate contractions. Because the heart-thumping nerve cells were derived from induced pluripotent stem iPS cells that in turn were made from human skin cells, the researchers believe the cells -- known as sympathetic nerve cells -- will be an aid in studying disorders that affect the nervous system -- that is, scientists will be able to grow nerve cells in the lab that replicate particular patients' diseases. Gabsang Lee, Ph. Sympathetic nerve cells are part of the so-called sympathetic nervous system that more or less automatically activates and regulates breathing, heart rate, visual focus, digestion and fear response. The cells connect the brain to the eyes, blood vessels and most internal organs, and are rarely influenced by conscious thought.
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