Cyclic motor activity; migrating motor complex: 1985.

Cyclic motor activity; migrating motor complex: 1985.
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循环运动活动;

DOI:
10.1016/0016-5085(85)90589-x
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发表时间:
1985
期刊:
影响因子:
29.4
通讯作者:
Sarna,SK
Sarna,SK
中科院分区:
医学1区
文献类型:
--
作者:
Sarna,SK

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大多数胃肠道和胆道都有周期性的运动活动。这种运动活动的电对应物称为周期性肌电活动。LES、胃和小肠中的典型运动周期由静止状态组成,随后是逐渐增加的收缩幅度和频率,最终达到最大收缩活动状态。结肠运动循环只有静止和收缩两种状态。在小肠中,这些运动复合体以外向方向迁移,而在结肠中则以内外两个方向迁移。这些复合物的起始和迁移机制在小肠中最好理解。这些复合物的起始和迁移似乎是由肠神经机制控制的。肠道机制的功能可由中枢神经系统和循环内源性物质调节。这些复合物的起始机制在胃肠道的其余部分和胆道中还不完全清楚。这些运动复合体的生理功能仅在非反刍动物的上消化道禁食几个小时后发生,可能是为了清除消化道中的残留食物、分泌物和细胞碎片。这种功能是由酶,酸和碳酸氢盐的协调分泌辅助的。在反刍动物中,第三阶段活动与摄取食物的远端推进有关。与胃肠道其余部分的循环运动活动不协调的结肠运动复合体的功能可能只是来回移动内容物以获得最佳吸收。
Most of the gastrointestinal tract and the biliary tract have a cyclic motor activity. The electric counterpart of this motor activity is called cyclic myoelectric activity. A typical motor cycle in the LES, stomach, and small intestine is composed of a quiescent state, followed by progressively increasing amplitude and frequency of contractions culminating in a state of maximal contractile activity. The colonic motor cycle has only the quiescent and the contractile states. In the small intestine, these motor complexes migrate in an aborad direction, and in the colon in both orad and aborad directions. The mechanisms of initiation and migration of these complexes are best understood in the small intestine. Both the initiation and migration of these complexes seem to be controlled by enteric neural mechanisms. The functions of the enteric mechanisms may be modulated by the central nervous system and by circulating endogenous substances. The mechanisms of initiation of these complexes are not completely understood in the rest of the gastrointestinal tract and in the biliary tract. The physiologic function of these motor complexes that occur only after several hours of fast in the upper gastrointestinal tract of nonruminants may be to clean the digestive tract of residual food, secretions, and cellular debris. This function is aided by a coordinated secretion of enzymes, acid, and bicarbonate. In ruminants, phase III activity is associated with the distal propulsion of ingested food. The function of colonic motor complexes that are not coordinated with the cyclic motor activities of the rest of the gastrointestinal tract may be only to move contents back and forth for optimal absorption.
通过负染色、葡萄糖或在单宁酸存在下包埋而保存用于电子显微镜的薄过氧化氢酶晶体的投影结构的等效性。
DOI: 10.1016/0022-2836(83)90113-4
发表时间: 1983
影响因子: 5.6
作者:
C. Akey;S. Edelstein
通讯作者: S. Edelstein
[134] 细胞色素 c(黑粉菌)
DOI: --
发表时间: 1955
期刊:
影响因子: --
作者:
J. Neilands
通讯作者: J. Neilands
染色和未染色螺旋的衍射图案:一致性还是矛盾?
DOI: --
发表时间: 1984
期刊: Ultramicroscopy
影响因子: 2.2
作者:
B. Trus;A. Steven
通讯作者: A. Steven
DOI: 10.1063/1.1138336
发表时间: 1985
影响因子: 1.6
作者:
H. Shuman;P. Kruit
通讯作者: P. Kruit
DOI: 10.1016/0022-2836(70)90036-7
发表时间: 1970-01-01
影响因子: 5.6
作者:
DEROSIER, DJ;MOORE, PB
通讯作者: MOORE, PB