• Summary
  • Contents
  • Subject index

Via 100 entries, 21st Century Psychology: A Reference Handbook highlights the most important topics, issues, questions, and debates any student obtaining a degree in the field of psychology ought to have mastered for effectiveness in the 21st century. This two-volume reference resource, available both in print and online, provides an authoritative source to serve students’ research needs with more detailed information than encyclopedia entries but without the jargon, detail, or density found in a typical journal article or a research handbook chapter. Students will find chapters contained within these volumes useful as aids toward starting research for papers, presentations, or a senior thesis, assisting in deciding on areas for elective coursework or directions for graduate studies, or orienting themselves toward potential career directions in psychology.


Neurotransmission involves the sharing of information within the nervous system from one neuron, or nerve cell, to another membrane (i.e., another neuron, muscle, or gland). This process entails a passage of electrical and chemical information from one neuron to many other neurons or organs. In order to explain the process of neurotransmission, we must first understand the key components of the neuron, the characteristics of the neuronal membrane, the process of stimulating the cell, the action potential, and neurotransmitter release.

Parts of a Neuron

The human body contains approximately 100 billion neurons with cell bodies ranging in size from 6–8 µm to 80 µm in diameter (Kandel, 1991). Researchers have divided neurons into three main categories based on function: sensory neurons, motor neurons, and interneurons. Sensory ...

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