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The Biological Aspects of Psychology

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Submitted By sufiajabeen101
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Neurotransmitters: communication between neurons across synapse
Are stored in vesicles at axon tips -> go to post synaptic cells and attach to receptors: protein sites on the surface of a cell; specific to neurotransmitter
• Each neurotransmitter can bind to different receptor types
• Have different effects depending on which type of receptor it binds to.
The chemical signal that crosses the synapse creates an electrochemical signal.
Postsynaptic Potential: change in membrane potential of postsynaptic cell
• Postsynaptic potential fades as it flows along
Excitatory postsynaptic potential: depolarizing postsynaptic potential (if positively charged molecules flow into the neuron)
• single EPSP isn’t enough to fire
Inhibitory postsynaptic potential: positively charged molecules flow out; hyperpolarization makes neuron less likely to fire an AP.
Junction of axon: is specialized region where new AP’s are generated
• The firing of a cell depends on what signals are present at junction.
Brain and spinal cord, neurons are organized into groups
Neural networks Sensory systems: group of neurons that provide info about the environment
• (hearing, vision, taste, smell, and touch)
Motor systems: parts of the NS that influence muscles and other organs to respond to the environment.
Peripheral Nervous System: includes all the nervous system not housed in bone, carries out sensory and motor functions Central Nervous System: encased in bone (brain, inside the skull, and the spinal cord, inside the spinal column) – where information is usually sent.
Somatic Nervous System: transfers information from the senses to the CNS and carries signals from the CNS to muscles [part of PNS]
Autonomic Nervous System: carries messages back and forth between the CNS and the heart, lungs, and other glands/organs. [part of PNS]
• Sympathetic – mobilizes the body for action

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