Muscle fibers are supplied by individual motor neurons, forming motor units; the greater the required force, the more motor units are recruited.
Las fibras musculares son suministradas por neuronas motoras individuales, formando unidades motoras; cuanta mayor fuerza se necesite, más unidades motoras se activarán.
| Front | myofibrils bands, Z-line, sarcomere and H-zone |
|---|---|
| Back | myofibrils have light bands (I-bands, present in region where actin/myosin not overlapping) and dark bands (A-bands, present in regions where thick myosin present, edges even darker as actin overlaps myosin) Z-line found at centre of each light band, distance between adjacent Z-lines known as sarcomere (individual unit of myofibrils), H-zone is lighter region found in centre of each dark band where only myosin present, when contracted, sarcomeres shorten and H-zone dec |
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