Name four components of a motor unit. In what ways can these components vary among motor units?
What will be an ideal response?
ANS: Anterior horn cell (AHC), axon, motor end plate, and muscle fibers. The AHCs and axons may
vary in size and thickness. Larger AHCs have larger axons, which conduct more rapidly (assuming
myelination). The number of fibers may vary from motor unit to motor unit (each fiber has a motor
end plate). Larger AHCs and thicker axons are associated with a greater number of fibers in the
motor unit.
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