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Unit 3 Biology of Behavior The Neuron Dendrites: Tree
Unit 3 Biology of Behavior The Neuron Dendrites: Tree

... branches, it causes the synaptic vesicles to release neurotransmitters into the synapse. b. The neurotransmitters then bind to receptor sites on the receiving neuron (like a key fitting into a lock). Some neurotransmitters are excitatory (create a new action potential) while others are inhibitory (s ...
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... potential. This indicates that a neuron's reaction is A) inhibited by the myelin sheath. B) delayed by the refractory period. C) an all-or-none response. D) dependent on neurotransmitter molecules. E) primarily electrical rather than chemical. 9. Neurotransmitters are released from vesicles located ...
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... dynamic element with complex nonlinear behavior8. The output of a synapse depends on its input, because of a host of presynaptic mechanisms, including paired-pulse facilitation, depression, augmentation and post-tetanic potentiation. In many physiological experiments designed to study the properties ...
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... 2. What are the two primary cells of the nervous system, and what do they do? The two primary cells of the nervous system are neurons, that actually carry and store information, and glial cells that support the neurons. 3. What protects the brain? The brain is protected by the bones of the skull and ...
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... aldehyde-fixed tissue, asymmetric synapses include axons that contain predominantly round or spherical vesicles and form synapses that are distinguished by a thickened, postsynaptic density. In contrast, symmetric synapses involve axons that contain clusters of vesicles that are predominantly flatte ...
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Activity-dependent plasticity

A defining feature of the brain is its capacity to undergo changes based on activity-dependent functions, also called activity-dependent plasticity. Its ability to remodel itself forms the basis of the brain’s capacity to retain memories, improve motor function, and enhance comprehension and speech amongst other things. It is this trait to retain and form memories that is functionally linked to plasticity and therefore many of the functions individuals perform on a daily basis. This plasticity is the result of changed gene expression that occurs because of organized cellular mechanisms.The brain’s ability to adapt toward active functions has allowed humans to specialize in specific processes based on relative use and activity. For example, a right-handed person may perform any movement poorly with his/her left hand but continuous practice with the less dominant hand can make both hands just as able. Another example is if someone was born with a neurological disorder such as autism or had a stroke that resulted in a disorder, then they are capable of retrieving much of their lost function by practicing and “rewiring” the brain in order to incorporate these lost manners. Thanks to the pioneers within this field, many of these advances have become available to most people and many more will continue to arrive as new features of plasticity are discovered.
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