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Action potential

Ch 28 Biology

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Topic 6.5 The Nervous System 0 IB Objectives Neurons transmit electrical impulses. The myelination of nerve fibers allows for saltatory conduction. Neurons pump sodium and potassium ions across their membranes to generate a resting potential An action potential consists of depolarization and repolarization of the neuron. Nerve impulses are action potentials propagated along the axons of neurons. Propagation of nerve impulses is the result of local currents that cause each successive part of the axon to reach the threshold potential. Synapses are junctions between neurons and between neurons and receptor or effector cells. When presynaptic neurons are depolarized they release a neurotransmitter into the synapse.

Module 4 part 1

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Doreen Pang Mrs. Trainor AP Psychology 5 October 2016 Module 4-1: Neural and Hormonal Systems Neural Communication Body?s info sys. is built from billions of neurons Systems are composed of smaller subsystems Biophysical systems Smaller system in med sys. in large sys. Biological psychologists Branch of psychology concerned with the links btwn biology and behvaior. gaining better understanding of: Sleep and dreams depression and schizophrenia hunger and sex stress and disease Neurons Neurons building blocks of the nervous system Dendrite fibers on a neuron that receive info and conduct it toward the cell body Axon fibers that pass the message along to other neurons Dendrites speaks, Axons listen Motor neurons controls muscles neural system?s giant redwoods Myelin Sheath

Myers Psychology Chapter 2 Vocabulary (6th Edition)

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Biological Psychology – Focuses on links between biology and behavior. Neuron – A nerve cell Dendrite – Branching extension, receives messages Axon – Extension of a neuron, sends messages Myelin Sheath – Helps protect and insulate Action potential – A neural impulse, electrical charge that travels down the axon. Threshold – the level of stimulation required to trigger a neural impulse. Synapse – The junction between the axon tip (send) and the dendrite (receive) Neurotransmitters – Chemical messengers that traverse the synaptic gaps between neurons. Acetylcholine – Triggers muscle contractions Endorphins – “Natural morphine”, Pain control and pleasure. Nervous system – Electrochemical communication system of the body

Psychology Chapter 3: The Biological Bases of Behavior

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The Neural Impulse: Using Energy to Send Information pg75 • Neuron At Rest -The Neuron at rest is a small battery, from the uneven Ion charges from the fluid around it of Sodium (Na) and Potassium (K). -Resting Potential – The Stable, Negative Charge when the Cell is inactive. •The Action Potential - Action Potential – A very brief shift in a Neuron’s electrical charge that travels along an axon. -Absolute Refractory Period – Minimum length of time after an action potential during which another action potential cannot begin. Only about 1 or 2 Milliseconds. -All-Or-None Law – Neural Impulses either Fire or don’t fire. There is no Half-Fire. A faster Rate of transmission means a stronger Stimulus. •The Synapse
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