10-3 Regulating the Cell Cycle


" 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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