BIOL 2312 Lecture Notes - Lecture 4: Threshold Voltage, Motor Neuron, Autonomic Nervous System

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27 Jan 2017

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Lecture 4: synapse & function/organization of the brain. Diffuses to the other side of the cleft and binds to ligand-gated receptor proteins. Neurotransmitter action is terminated by enzymatic cleavage or cellular reuptake. Reuptake: reuses neurotransmitters that take a lot of energy to make. Crosses synapse between motor neuron and a muscle fiber. Binds to the postsynaptic receptors and opens ligand gated channels. This produces a depolarizing effect called and excitatory post synaptic potential. (epsp) Degrades ach and causes muscle relaxation. lecture notes page 1. Epsp is more positive (higher than membrane potential) Ipsp is more negative (lower than membrane potential) So, to sum it up, depolarization with excitatory neurotransmitters like glutamate causes. Epsp is above normal membrane potential which is -70mv. Hyperpolarization is with inhibitory neurotransmitters like gaba and glycine and they cause ipsp by allowing cl- to flow into the postsynaptic neuron. Not produced in the brain made in the body. Norepinephrine: both are responsible for fight or flight.

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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BIOL 2312 Lecture Notes - Lecture 4: Threshold Voltage, Motor Neuron, Autonomic Nervous System

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