Abstract
1. 1. In the majority of experiments the ruminal preparations did not exhibit spontaneous electrical and contractile activity but showed a Ca-dependent spike-free myogenic tone. 2. 2. Ba 2+ or Sr 2+ evoked spike activity and phasic contractions and increased the muscle tonic tension. 3. 3. Tetraethylammonium (TEA) exerted no effect on the ruminal preparations but potentiated the effect of Ba 2+. 4. 4. Acetylcholine (ACh) induced dose-dependent spike-free tonic contractions which were verapamil resistant and were suppressed by sodium nitroprusside. When applied to BaCl 2- or TEA-pretreated preparations ACh caused spike activity and phasic contractions. 5. 5. The antral abomasum exhibited a spontaneous electrical activity—slow waves on which spike potentials were superimposed. 6. 6. ACh and TEA induced membrane depolarization and increased the spike activity and the phasic contraction amplitude.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
