01:119:116 Lecture Notes - Lecture 20: Excitatory Postsynaptic Potential, Sensory Neuron, Axon Hillock

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12 Jun 2017

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A. a)junction between a synapse term and another neuron or effector. B. b)presynaptic neuron: synthesizes neurotransmitter and stores vesicles (b. b. 1) Vesicles fuse with terminal membrane and release neurotransmitter (b. b. 4) Receptor protein binds and responds to neurotransmitters (b. c. 2. i) directly opposite synaptic terminal (b. c. 2. ii) Opens channel and allows specific ions to diffuse across post synaptic membrane (b. c. 2. iii) Excitatory postsynaptic potential (epsp): membrane depolarizes when channels open. Inhibitory postsynaptic potentials (ipsp): membrane hyperpolarizes when channels open. Postsynaptic neurons receive many signals (epsp & ipsp) (d. c. 2) If epsp is too small by axon hillock no signal. Temporal summation: rapid stimuli additive effect (many keep adding up) (d. d. 2) Spatial summati0on: many different dendrites receive (many dendrites receive a lot a once) Ii) memory and learning: nervous system development. Structure of nervous system establishes (a. a. 1. i) gene expression (a. a. 1. ii) Brain continues to develop and remodel (a. a. 2. i) competition for growth supporting factors (a. a. 2. ii) Most reshaping occurs at synapses (a. b. 1. i)synaptic connections reinforced (a. b. 1. i. i)

Related Questions

The junction specialized for the transmission between a neuron and another cell is called a (1) _____ ______. Usually, the signal being sent to the receiving cell is carried by chemical messengers called (2) _____. (3) _____ is an example of this type of chemical messenger, which diffuses across the synaptic cleft, combines with protein receptor molecules on the muscle cell membrane, and soon thereafter is rapidly broken down by enzymes. At an (4) ____ synapse, the membrane potential is driven toward the threshold value and increases the likelihood that depolarization and an action potential will occur. At an (5) ____ synapse, the membrane potential is driven away form the threshold value, and the receiving neuron becomes hyperpolarized and is less likely to achieve an action potential. A specific transmitter substance can have either excitatory or inhibitory effects depending on which type of protein channel it opens up in the (6) ____ membrane. (7) ____ are neuromodulators that inhibit perceptions of pain and may have roles in memory and learning, emotional states, temperature regulation, and sexual behavior. (8) ____ ________ at the cellular level is the moment-by-moment tallying of all excitatory and inhibitory signals acting on a neuron. Incoming information is (9) ____ by the cell bodies, and the charge differences across the membranes are either enhanced or inhibited. Some narrow-diameter neurons are wrapped in lipid-rich (10) _______ produced by specialized neuroglial called Schwann cells; each of these is separated from the next by a(n) (11) ________ ________ - a small gap where the axon is exposed to extracellular fluid. A (12) ____ is an involuntary sequence of events elicited by a stimulus. During a (13) _______ ________, a muscle contracts involuntary whenever conditions cause a stretch in length; many of these help you maintain an upright posture despite small shifts in balance. Imbalances can occur at chemical synapses; a neurotoxin produced by Clostridium tetani blocks the release of GABA and glycine, thus freeing the motor neurons from (14) _____ control, which may cause tetanus â a prolonged, spastic paralysis that can lead to death. A. Excitatory H. Stretch reflex B. Inhibitory I. Summed C. Myelin J. Neurotransmitters D. Chemical synapse K. Postsynaptic E. Synaptic integration L. Endorphins F. Exposed node M. Acetylcholine (ACh)

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01:119:116 Lecture Notes - Lecture 20: Excitatory Postsynaptic Potential, Sensory Neuron, Axon Hillock

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