Regents Biology Mitosis & Cancer: When Making New Cells Goes Terribly Wrong!
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Transcript of Regents Biology Mitosis & Cancer: When Making New Cells Goes Terribly Wrong!
Regents Biology
Mitosis & Cancer:When Making New Cells
Goes Terribly Wrong!
Regents Biology
When is mitosis a good thing? When you have to add or replace cells
growth & development repair replacement
Regents Biology
Regulation of Cell Cycle
Regents Biology
Cells will not divide if…
there are not enough nutrients to support cell growth
DNA is damagedDNA has not been replicated
…cell will be repaired / destroyed.
Regents Biology
When is mitosis a BAD thing When cells reproduce & they are not
needed these cells take over organs, but don’t
do the right job they just keep making copies cancer
damages organs
Regents Biology
Growth of a tumor
Regents Biology
Healthy Cells grow in a single
layer stop dividing
when they receive messages from neighbouring cells
Cancer Cells do not respond to
messages from neighbouring cells…continue to divide
start to grow in multiple layers that form a tumor
Regents Biology
Why would cells just make copies?
If DNA gets damaged, cells stop listening to correct instructions mutations
Causes of mutations: UV radiation chemical exposure radiation exposure heat
cigarette smoke pollution age genetics
Regents Biology
Tumors Benign tumor
abnormal cells remain at original site as a lump
most do not cause serious problems &can be removed by surgery
Regents Biology
Tumors Malignant tumor
cells leave original site carried by blood system to other tissues start more tumors
damage functions of organs throughout body
Regents Biology
Watch how a tumor grows...
http://www.hhmi.org/biointeractive/media/angiogenesis-lg.mov
Regents Biology
Treatments for cancers Treatments kill rapidly dividing cells
chemotherapy poisonous drugs that kill rapidly dividing cells
radiation high energy beam kills rapidly dividing cells
side effects
Regents Biology 2009-2010
Show what you’ve learned!
Assignment:
Page 138 Questions14 to18