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psychology chap 3 - Chapter 3 Biological Bases of Mental...

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Chapter 3 Biological Bases of Mental Health and Behavior Three Kinds of Neurons: -Sensory Neurons Transmits information from sensory cells -Interneurons Nerve cells that connect other neurons with one another Most neurons in brain and spinal cord -Motor Neurons Transmit commands from interneurons to glands and muscles of the body Through spinal cord Neuron is composed of: Firing Neurons: At rest, a neuron is polarized. -Inside the neuron is a (-) negative charge -Outside the neuron is a (+) positive charge - = Resting Potential Graded Potential: -Once stimulation occurs… “excited” less likely to fire -Ripples ripples grow weaker or ripple strength is additive Action Potential (“firing”) -Ripple causes depolarization -Membrane becomes totally permeable -Ions come in, and change charge to positive -Positive ions pour back out, regains negative charge Transmission of Information: How does info move from one neuron to the next?
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