Human Biology: The Nervous System Flashcards | Quizlet Human Biology: The Nervous System. When the action potential reaches the axon terminal, ion channels for calcium open and calcium ions, Ca++, enter and trigger the release of the neurotransmitter. The released neurotransmitter diffuse across the tiny synaptic Human Biology: The Nervous System Questions and Study Human Biology: The Nervous System. Review of Chapter 28 of "Campbell Biology: Concepts and Connections" for Dr. Wojita's Human Biology class at OSU Marion. The 2 parts of the Nervous System. CNS - the Central Nervous System, which is the brain and spinal cord.
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