呼吸运动是一种节律性的活动，受呼吸中枢的调节。
Respiratory movement, known as a kind of rhythmic activity, can be regulated by respiratory center.
在此标本上记录到了颈4,5脊神经腹根及延髓神经元的节律性放电活动。
The periodic discharge activity was recorded from ventral root c4 or c5 and the neurons of medulla of the preparation.
珍珠囊细胞的分泌活动具有节律性和区段性的特点，这种区段性和节律性的分泌与珍珠多层结晶纤层的形成相适应。
The secretion of the pearl sac cells is rhythmic, which is adaptive for the formation of the multiple crystalline layers of the pearl.
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