" Cells divide at different rates-
Nerve
& muscle cells usually stop dividing once developed
Skin & bone cells grow & divid rapidly throughout life
" Controls on Cell Division
-Contact with other cells (see fig. 10-7 p. 250)
" Cell cycle regulators
o Cyclin
o Internal regulators
o External regulators
" Cancer = uncontrolled cell
growth
o Takes over the cell cycle
o Causes
environmental, genetic, viruses
STEM CELLS
" Unspecialized cells that have
the potential to differentiate (to become any type of cell)
" Found
o Human embryos
o Some adult cells
o Cord blood
" Uses
Repair injuries (brain & spinal cord)
Cure some diseases (diabetes)
Replace organs (liver tissue, heart valves)
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