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Example sentences for: contractions
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Experiments conducted at 37°C have demonstrated that the magnitude of staircase potentiation is proportional to muscle length with a negative slope [ 6 7 8 9 ] . This is the case, whether the staircase is conducted at the different lengths, or the poststaircase twitch contractions are evaluated at different lengths after staircase at a given length [ 6 10 ] . Length-dependence of posttetanic potentiation has been evaluated in vitro at room temperature, and it has been reported that there is a length-dependence of potentiation, with the fractional enhancement of force being proportional to muscle length with a positive slope [ 11 ] .
In studying posttetanic potentiation, the length tension relation for twitch contractions was obtained with sequential contractions at different lengths, both prior to and after a tetanic contraction at optimal length.
Contractions are even rarer in the Diary but do occur, for example in his entry for September 9, 1667: “Says that Knepp won't take pains enough.
Figure 2Aillustrates the length-tension relation for twitch contractions obtained at the start and end of 10 s of 10 Hz stimulation at each of 4 different sarcomere lengths in a given muscle preparation.
In cats, serotonin antagonists caused a decrease in bladder capacity [ 43 ] however in anesthetized rats, serotonin antagonism did not have an effect on micturition [ 44 ] . Recently, a selective 5-HT1A receptor antagonist (WAY-100635) was reported to inhibit bladder contractions in rats [ 45 ] yet another report only observed an increase in the pressure threshold [ 46 ] . Olanzapine and risperidone have only low to modest affinity for the 5-HT1A receptor, and higher affinities for the 5-HT2A and 5-HT2C receptors [ 11 12 ] . Serotonin 5-HT2 and 5-HT3 receptors facilitate pudendal reflexes in the cat [ 47 48 ] , therefore it is possible that antagonism of these receptors may block the EUS in the anesthetized rat.
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