Proventriculus of a marine annelid: muscle preparation with the longest recorded sarcomere.
Proventriculus of a marine annelid: muscle preparation with the longest recorded sarcomere.
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海洋环节动物的前胃：具有最长记录肌节的肌肉准备。
DOI：
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发表时间：
1972
影响因子：
11.1
通讯作者：
D. Smith
中科院分区：
文献类型：
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作者：
J. D. Del Castillo;M. Anderson;D. Smith
腺胃的每一块肌肉，即肠道中咽部后面的区域，都含有一条Z带，两侧各有一系列由粗(60-90 nm)和细(5 Nm)细丝组成的I-A-H-A-I带。粗丝表现出与副肌球蛋白相似的14 nm周期。肌细胞终止于外部I带的水平。严格意义上的肌肉不包括一对Z带所定义的完整的肌节，但相当的H-H距离达到约40微米。电生理学证据表明，细胞的收缩和松弛分别与去极化和超极化电位有关。
EACH MUSCLE OF THE SYLLID (ANNELIDA: Polychaeta) proventriculus, the region of the gut posterior to the pharynx, contains a single zigzagging Z band, flanked on each side by a sequence of I-A-H-A-I bands defined by thick (60-90 nm) and thin (5 nm) filaments. The thick filaments show a 14-nm periodicity similar to paramyosin. The muscle cell terminates at the level of the outer I bands. The muscle does not include a complete sarcomere in the strict sense, as defined by a pair of Z bands, but the equivalent H-H distance reaches about 40 mum. Electrophysiological evidence suggests that contraction and relaxation of the cell are, respectively, associated with depolarizing and hyperpolarizing potentials.