which part of our body is broken continueally and replaced by new stem cell
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according to me ------- liver is correct answer
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The epidermis suffers more direct, frequent, and damaging encounters with the external world than any other tissue in the body. Its need for repair and renewal is central to its organization.
The epidermis is a multilayered (stratified) epithelium composed largely of keratinocytes (so named because their characteristic differentiated activity is the synthesis of intermediate filament proteins called keratins, which give the epidermis its toughness) (Figure 22-2). These cells change their appearance from one layer to the next. Those in the innermost layer, attached to an underlying basal lamina, are termed basal cells, and it is usually only these that divide. Above the basal cells are several layers of larger prickle cells (Figure 22-3), whose numerous desmosomes—each a site of anchorage for thick tufts of keratin filaments—are just visible in the light microscope as tiny prickles around the cell surface (hence the name). Beyond the prickle cells lies the thin, darkly staining granular cell layer (see Figure 22-2). It is at this level that the cells are sealed together to form a waterproof barrier, fulfilling the most fundamentally important of all the functions of the epidermis. Mice that fail to form this barrier because of a genetic defect die from rapid fluid loss soon after birth, even though their skin appears normal in other respects.
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The epidermis is a multilayered (stratified) epithelium composed largely of keratinocytes (so named because their characteristic differentiated activity is the synthesis of intermediate filament proteins called keratins, which give the epidermis its toughness) (Figure 22-2). These cells change their appearance from one layer to the next. Those in the innermost layer, attached to an underlying basal lamina, are termed basal cells, and it is usually only these that divide. Above the basal cells are several layers of larger prickle cells (Figure 22-3), whose numerous desmosomes—each a site of anchorage for thick tufts of keratin filaments—are just visible in the light microscope as tiny prickles around the cell surface (hence the name). Beyond the prickle cells lies the thin, darkly staining granular cell layer (see Figure 22-2). It is at this level that the cells are sealed together to form a waterproof barrier, fulfilling the most fundamentally important of all the functions of the epidermis. Mice that fail to form this barrier because of a genetic defect die from rapid fluid loss soon after birth, even though their skin appears normal in other respects.
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