bladder Animal 12 Rats 12 rat 12 Bladder 10 Muscle Contraction 10 Rats, Inbred Strains 10 In Vitro 8 Male 8 Support, Non-U.S. Gov't 8 animal cell 8 drug comparison 8 drug efficacy 8 muscle 8 nonhuman 8 priority journal 8 atropine 6 drug administration 6 in vitro study 6 Comparative Study 4 Electric Stimulation 4 Female 4 Prostaglandins 4 Tetrodotoxin 4 animal experiment 4 cyproheptadine 4 drug interaction 4 drug response 4 endocrine system 4 indometacin 4