They have got a neurogenic heart, which has rhythmic depolarization that's liable for initiating heartbeats.[25]: 653 Heartbeats originate in anxious tissue; innervated muscle mass cells trigger the guts to contract when stimulated by nerve impulses. The cardiac ganglion, which is made up of 9 neurons, attaches to the dorsal wall https://keikop876izq6.blognody.com/profile