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7 Cards in this Set
- Front
- Back
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Normal function without cell division |
Some mature cells never divide eg. Cardiac muscle cells and nerve cells Some mature cells divide only to replace cells lost (in disease) eg. Skin and gut cells |
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Somatic cell division |
Produces identical daughter cells For growth or renewal & repair. (Reproductive cell division produces non-identical daughter cells) |
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Two major periods of somatic cell division |
Interphase- replication of DNA Duplication of cell contents
Mitotic phase- Mitosis and cytokinesis |
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Cell death |
APOPTOSIS- controlled death |
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DNA replication |
DNA strands unwind DNA polymerase binds to exposed bases DNA polymerase attaches complementary nucleotides along each strand to form 2 identical copies of DNA |
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Uncontrolled cell division |
Excess -> tumour Insufficient growth -> loss of tissue mass 2 forms of tumours: -Benign tumour-harmless, do not metastasize(no secondary tumours form) Malignant Tumur-may be fatal, metastasise |
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Cell fate determination |
Depends on: Cell poliferation Cell specialization Cell interaction Cell movement
If a cell is committed its cell fate can be reversed or transformed But if a cell is in determined state it cannot be reversed or transformed. |
