10-1 Cell Growth 10-2 Cell Division 10-3 Regulating the Cell Cycle Unit 7: Cell Growth and Division

10-1 Cell Growth Why do cells divide rather than getting larger in size? Demands on information from the DNA becomes too great The cell has difficulty moving enough nutrients and wastes across the cell membrane

10-1 Cell Growth: Division of the Cell

10-2 Cell Division Why do cells divide? To repair damaged or old cells So the organism can get larger (grow)

10-2 Cell Division

10-2 Cell Divison Chromosomes

Parts of a Homologous Pair of Chromosomes

10-2 Cell Division The Cell Cycle

The Cell Cycle The cell cycle has four phases: G 1 S phase G 2 M phase

10-2 Cell Division Events of the Cell Cycle

10-2 Cell Division Interphase

Mitosis: The division of the nucleus

Mitosis At the end of Interphase Prophase MetaphaseAnaphase Telophase Blood lilly Mitosis At the end of Interphase Prophase Metaphase AnaphaseTelophase

10-2 Cell Division Cytokinesis

Do You Know the Stages of Mitosis? CYTOKINESIS PROPHASE ANAPHASE INTERPHASE METAPHASE TELOPHASE

10-3 Regulating the Cell Cycle

Uncontrolled Cell Growth

What Causes Cancer? Gene changes due to: diet tobacco use exposure to radiation exposure to chemicals Inherited genes (cyclins/growth factors don’t work) Immune System Failure Carcinogens

Allergic reactions – swelling – itching also flu like symptoms – greatest concern is extreme allergic reactions Biological Therapy: Elicits a response from your immune system (helps immune system fight cancerous cells) Weakening of the bones can -effect sex characteristics Similar to radiation therapyChemotherapy: Chemicals target cancer cells given 2 or more at a time Can injure or kill healthy cells Restricted to a few types of cancer - may not get all cells-damages organsSurgery: physically remove tumor Side Effects Treatment

Cancer Among Men The three most common cancers among men include: Prostate cancer Lung cancer Colorectal cancer The leading causes of cancer death among men are: Lung cancer Prostate cancer Liver cancer

Cancer Among Women The three most common cancers among women include: Breast cancer Lung cancer Colorectal cancer The leading causes of cancer death among women are: Lung cancer Breast cancer Colorectal cancer