Advances in Physiological Sciences, Volume 22: Neurotransmitters in Invertebrates provides information pertinent to the fundamental aspects of transmitter research in invertebrates. This book discusses the significant contribution of studies on invertebrates to the discovery or postulation of other transmitters. Organized into three parts encompassing 33 chapters, this volume begins with an overview of the study of synaptic transmission in central neurons, which is restricted by the difficulty of recording individual miniature postsynaptic potentials or currents. This text then examines the reversal potential of depolarization. Other chapters consider acetylcholine as an excitatory neurotransmitter at synapses in the central nervous system of insects. This book discusses as well the role of ions in the process of neuromuscular transmission. The final chapter deals with the growing interest in the research of neurotransmitters. This book is a valuable resource for scientists, zoologists, physiologists, electrophysiologists, graduate students, teachers, and research workers.