the effects of adenyl compounds on the axolotl ( urodele ) heart suggest that , like the frog ( anuran ) heart , both p1- and p2-purinoceptors are present in the axolotl atrium and that only p2-purinoceptors are present in the axolotl ventricle , although adenosine does produce an inhibitory effect on the ventricle which is probably mediated via the release of a neurotransmitter other than acetylcholine .
C0018787
heart
C0018827
ventricle