Stem Cells.

A DETAILED DEFINITION OF theme electric cellS

A STEM CELL IS A CELL THAT HAS THE CAP strength TO DEVELOP INTO ANY OF THE antithetical CELL TYPES THAT MAKE UP THE TISSUES AND ORGANS OF THE personify. STEM CELLS ar THE ORIGINAL CELLS FROM WHICH AN ENTIRE ORGANISM DEVELOPS. THEY are ALSO run aground IN grown ORGANS. EMBRYONIC STEM CELLS (ESC S) COME FROM A BLASTOCYST (A VERY YOUNG EMBRYO THAT CONTAINS 200 TO 250 CELLS AND IS shaped LIKE A HOLLOW SPHERE). STEMS CELLS ARE THE ACTUAL CELLS internal THE BLASTOCYST THAT WOULD DEVELOP INTO A PERSON OR ANIMAL. ADULT STEM CELLS COME FROM THE UMBILICAL CORD AND PLACENTA, OR FROM: BLOOD, chock up amount of money, SKIN, AND OTHER TISSUES.

MEDICAL RESEARCHERS ARE INTERESTED IN USING STEM CELLS TO REPAIR/ REPLACE DAMAGED BODY TISSUES, BECAUSE STEM CELLS ARE LESS LIKELY THAN OTHER FOREIGN CELLS TO BE jilted BY THE IMMUNE SYSTEM WHEN THEY ARE IMPLANTED INTO THE BODY. THEY boast BEEN USED EXPERIMENTALLY TO FORM THE HEMATOPOIETIC (BLOOD-MAKING) CELLS OF THE BONE MARROW & HEART, BLOOD VESSEL, MUSCLE, AND INSULIN-PRODUCING TISSUE. EMBRYONIC GERM LINE CELLS render BEEN USED TO HELP PARALYZED MICE REGAIN SOME OF THE ABILITY TO MOVE.

MANY TYPES OF STEM CELLS EXIST IN THE HUMAN BODY, AND THEY ALL gravel THE capacitor TO REPLICATE AND TO SELF-RENEW. ANOTHER CHARACTERISTIC IS THAT THEY render THE CAPACITY TO DIFFERENTIATE IN ORDER TO PRODUCE SPECIFIC BODY PARTS, SUCH AS MUSCLE CELLS, SKIN CELLS, NERVE CELLS, ETC . . . SCIENTISTS remember THAT THEY ARE ORGANIZED IN A HIERARCHY accord TO A SCALE OF SPECIALIZATION.

totipotent STEM CELLS (TOP OF THE STAIRCASE)

TOTIPOTENT (TOTALLY POTENT) STEM CELLS HAVE THE CAPABILITY TO FORM EVERY TYPE OF BODY CELL. IT IS THE early CELL DIVISION OF A ZYGOTE (FERTILIZED EGG).



EACH TOTIPOTENT CELL CAN REPLICATE & DIFFERENTIATE,

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