WS+Death+by+Design

- Programmed Cell death (PCD) or cell suicide

- Cancer cell bypass continue to divide and make a tumor

CELL - Leeuwenhoek -Animal Cells - Community of Cells - Different roles in this community of cells - Multicellular communities come much much later (during evolution)

HOW DO CELLS COMMUNICATE TO EACH OTHER? -cancer cells don't listen to the signals move grow divide or don't divide -Put one cell in a dis - it dies it kills itself PCD -the only reason cells live is other tell it to lice -PCD requires the cell to make molecules to kill itself it participates in its own death

-cell starts PCD when "told" to die

PCD -"neat" deatn -destroying evidence (eat the dead cell) -webbed feet- destroy web part - kill it -PCD of neurons (80%) in developin fetus -analogy: when making an animal you have to kill/destroy/remove the scafolding

hmans= 10 worm=959

WHY MAKE A CELL IF YOU ARE GOING TO TELL IT TO DIE -probably because that cell had a purpose in a ancestor but not now

CAUSES -smoking -radiation -sun Tumor Suppressors are damaged