Chapter 12, lecture 3, 4-16-08

Chapter 12, lecture 3, 4-16-08 - Undifferentiated Cells A...

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Undifferentiated Cells A fertilized egg  is a single cell  whose cellular descendants can  form all the different cell types of  the body During development, both cell  occur Differentiation occurs in steps
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Undifferentiated Cells cont. Stem cells Potentiality : Some ability for differentiation  must remain in adult tissues that  constantly need repair.   Cells that maintain the ability to  differentiate in adulthood are  called adult stem cells .
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Average life spans of human differentiated cell types CELL TYPE LIFE SPAN (DAYS) Intestinal lining 1.3 Stomach lining 2.9 Tongue surface 3.5 Uterine cervix 5.7 Stomach mucus 6.4 Cornea 7 Epidermis: abdomen 7 Epidermis: cheek 10 Lung alveolus 21 Lung bronchus 167 Kidney 170 Bladder lining 333 Liver 450 Adrenal cortex 750 Brain nerve 27,375 + (75+ yrs)
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Stem Cells organisms of different ages still  contain the full amt. of DNA often
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Chapter 12, lecture 3, 4-16-08 - Undifferentiated Cells A...

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