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George E. Carvell, PhD, PT   University of Pittsburgh
 
BC&P Fig. 2.7, p. 28
BC&P Fig. 2.12, p. 32
BC&P Fig. 2.4, p. 25
NEURON: BASIC UNIT OF INFORMATION INTEGRATION & TRANSMISSION
The neuron is a post-mitotic cell incapable of replicating itself. However, like other cells it has organelles to manufacture and regulate proteins and chemicals for normal function; and mitochondria to provide energy for the high metabolic demands of these excitable cells (fig 2.7). A neuron extends its cytoplasm from its body (soma) by way of neurites (fig 2.4). This requires special cytoskeletal proteins (filaments) and protein transport tubules (microtubules): see fig 2.12
Microtubules provide highways for axonal trafficking of  vesicles containing proteins and biochemicals. Anterograde transport = soma to axon, retrograde
= axon to soma