PSYC100 Lecture Notes - Lecture 12: Aphasia, Sodium-Potassium Alloy, Auditory Cortex
PSYCH100 - FOUNDATIONS OF PSYCHOLOGY
Wk. 12 - Requests, exam information, and wrapping up
Neurons and Neural Messages
Dendrite
Dendrite specialise in receiving information
Sensory cells or other neurons
Axon
Axon transmit neural message along the length of the neuron
Terminal Button and Synapse
Terminal button: end point of the neuron
Synapse: connection between terminal button and the dendrite of the next neuron,
gland or muscle
Action Potential
Resting Potential (resting neuron)
Neuron not firing but is ready.
Polarizing – inside negative charge/outside positive charge
More positive outside the neuron and more negative inside the neuron
Firing of a Neuron (neural impulse)
Ion channels open in membrane (wall of the neuron)
Positive ions (Sodium: Na+) rush into neuron
Electrical charge in the neuron is not positive
Neural message travels along neuron
It doesn’t happen simultaneously in the entire neuron
Change in electrical charge in one area causes a change in electrical charge in the
next area
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Refractory Period
Period in which neuron will not fire again
Negative charge on the inside of the neuron (lower than resting potential)
Original ion channels (Na+) close to stop positive ions entering
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
12 - requests, exam information, and wrapping up. Axon transmit neural message along the length of the neuron. Terminal button: end point of the neuron. Synapse: connection between terminal button and the dendrite of the next neuron, gland or muscle. Polarizing inside negative charge/outside positive charge. More positive outside the neuron and more negative inside the neuron. Ion channels open in membrane (wall of the neuron) Positive ions (sodium: na+) rush into neuron. Electrical charge in the neuron is not positive. It doesn"t happen simultaneously in the entire neuron. Change in electrical charge in one area causes a change in electrical charge in the next area. Period in which neuron will not fire again. Negative charge on the inside of the neuron (lower than resting potential) Original ion channels (na+) close to stop positive ions entering. Other ion channels open (potassium: k+) to let positive ions leave and then closes. Na-k pump returns the cell to normal resting potential.
