DH+cells

Death By Design Notes

Programmed Cell Death (PCD) Cell Suicide Cancer Cells Bypass PCD Continue to divide and make a tumor

Cell Leeuwenhoek Created the first microscope Looked at union cells Animal Cells - have no walls, look like "soap bubbles" Community of Cells Different roles in this community of cells Multicellular communities came much much later (during evolution

How do cells communicate with eachother? Cancer Cells don't "listen" to signals -move -grow -divide! or don't divide! Put one cell in a dish - it dies. it kiss itself The only reason cells live is other cells tel it to 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" death destroy evidence (eat dead cell) Webbed Feet - destroy web part - kill it PCD of neurons (80%) in developing fetus analogy: when making an animal you have to kill/destroy/remove the scaffolding

Humans = 10^13 cells worm = 959 cells

Why make a cell if you are going to tell it to die? Probably because that cell had a purpose in an ancestor but not now.