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Chapter 3 Definition
CHS Psychology class Jack- Chapter 3 Definitions
Question | Answer |
---|---|
Cell Body | The main section of neuron that contains the nucleus. |
Nucleus | Contains the genetic information that determines how the cell will function. |
Dendrites | Fibers that receive signals from other neurons. And carry those signals to the cell body. |
Axon | Fibers that send signals to where communication occurs with other neurons. |
Myelin | Fatty substance that wraps around axons and increases the speed of action potentials |
Synapse | The tiny gap between neurons across which the neurons communicate. |
Receptor | Sites on the surface of cells that allow only one type of neurotransmitter to fit into them, triggering a chemical response that may lead to an action potential. |
"All or None" | The idea that if a neuron responds at all it must respond completely. |
Reflexes | automatic, involuntary reactionswhen sigals do not pass through the brain. |
Afferent Neurons | convey information from tissue and organs to the brain. |
Efferent Neurons | Transmit information from the brain to the muscles. |
Neurons | Fundamental unit of the nervous system, nerve cells. |
Neurotransmitters | Chemicals in synapse that transmit information between neurons. |
Acetycholine | Neurotransmitter that activates muscles. |
Dopamine | Neurotransmitter associated with pleasure system, voluntary movements, emotion. |
Norepinehrine | Neurotransmitter associated with stress, fight or flight response. |
Serotonin | Neurotransmitter inhibits anger, aggression, arousal, and sleep. |