Comparative morphology of the cardiac conduction tissue in animals.
D000717:Anatomy, Comparative; D000818:Animals; D001717:Birds / Q000033:anatomy & histology; D006329:Heart Conduction System / Q000033:anatomy & histology*; D008322:Mammals / Q000033:anatomy & histology; D012104:Reptiles / Q000033:anatomy & histology; D012849:Sinoatrial Node / Q000033:anatomy & histology