【正文】
cle) cardiac muscle Z line M line light band dark band sarere H band diad skeletal muscle Z line M line light band dark band sarere triad H band smooth muscle nucleus nucleolus rough endoplasmic reticulum neuron synapse synapse vesicle presynaptic membrane postsynaptic membrane synaptic cleft lipofuscin granule absorptive cell microvillus Pah cell secretory granule rough endoplasmic reticulum collagenous fiber colla