No Slide Title - glenbrook s hs
Download
Report
Transcript No Slide Title - glenbrook s hs
THE CELL CYCLE
Fig. 7.6
CANCER
Fig. 7.9
Cell Cycle Control
Cells that are not directed by the cell cycle
control system tend to divide out of control
This can result in a benign tumor
(abnormal mass of essentially normal cells)
Can cause problems depending on where they
are located
Always remain at the original site in the body
Displaces normal tissue as it grows
What is Cancer?
Cancer cells have a have a faulty cell cycle,
divide out of control and demonstrate
bizarre behavior
Malignant tumor – lump that results from
the division of a cancer cell
Can spread into nearby tissue or other parts of
the body
Displaces normal tissue as it grows
Can spread into the circulatory system
Metastasis – spread of cancer cells from origin
Cancer cont.
Cancers are named for where they originate
4 categories
1. Carcinomas – originate in the external or internal
coverings of the body
EX – skin or linings of the intestines
2. Sarcomas – arise in tissues that support the body
EX – bone and muscle
3. Leukemia – cancer of the blood forming tissue
EX – bone marrow
4. Lymphomas – cancer of the blood forming tissue
EX – lymph nodes
Cancer Treatments
Surgery or another method to stop cells from dividing…
• Radiation Therapy –
Cancer cells exposed to
high-energy radiation
to disrupt cell division
Radiation can usually
destroy cancer cells
without harming too
many normal cells
Can have bad side
effects
EX – sterility if near
ovaries or testes
• Chemotherapy –
Drugs that disrupt cell
division are administered
Antimitotic drugs –
prevent cell division by
interfering with spindle
formation
EX – taxol and vinblastine