title: Mechanical properties of the mammalian vas deferens. II. In the active state.
abstract: The mechanical response of the vas induced by field stimulation is described in this paper. The experiments were performed, in vitro, on vasa from Sprague-Dawley albino rats. In the maintained ac tetanic stimulation, the active force achieves the peak magnitude in about 1 to 1.2 sec; thereafter, it relaxes gradually. For a given stimulus voltage (amplitude), a maximal response is elicited at 60 Hz. At 6000 Hz, and greater, no response is elicited. The ability to respond to stimulus dies out in 2 hr at 5 degrees C above the normal temperature of 37 degrees C; the ability to respond to stimulus remains unaffected at 5 degrees C below the normal temperature. The active force is always larger than the passive force when the vas is subjected to titanic stimulation near its in situ length.
mesh_terms: D000818:Animals; D004558:Electric Stimulation; D008297:Male; D008722:Methods; D009119:Muscle Contraction; D051381:Rats; D014649:Vas Deferens / Q000502:physiology*