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(Solved): please help ASAP!! will rate hapter 11 Assignment 3 17. Nerve impulses in the start with neurotransm ...



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hapter 11 Assignment 3 17. Nerve impulses in the start with neurotransmitters released by presynaptic neurons. 18. These neurotransmitters will cause an or an 19. EPSPs are depolarizations caused by the movement of or into the cell. 20. IPSPs are hyperpolarizations caused by the movement of potassium the cell or chloride the cell. 21. The IPSPs and EPSPs produced determine if an action potential is produced in the postsynaptic neuron through a process called 22. Summation can be with EPSPs and IPSPs produced by different neurons added together, or 23. Summation occurs at the with multiple IPSP 5 or EPSPs produced by a single neuron being added together. action potential is generated. (initial segment) and if threshold is reached, an 24. When threshold is reached, of voltage-gated sodium channels in the axon hillock open and sodium floods the neuron. 25. The flows forward in the axon triggering the next set of voltage-gated sodium channels to open. 26. This initiates a where the movement of sodium causes depolarization which eauses voltage-gated sodium channels to open and more sodium to move into the neuron. 27. This positive feedback cycle continues until all the voltage-gated sodium channels are open and the axon reaches 28. This wave of depolarization down the axon. 29. If the axon is myelinated, the propagating action potential jumps from node to node using , quickly traveling down the axon. 30. If the axon is not myelinated, the propagating action potential travels through , slowly opening the many voltage-gated sodium channels on the axon. 31. When the wave of depolarization arrives at the axon terminal, 32. floods the axon terminal. 33. Calcium binds to 34. A is released in the synaptic cleft by exocytosis. 35. Following the wave of depolarization on the axon, channels close and slow activation gates on on the voltage-gated sodium 36. The flow of sodium stops and leaves the neuron. 37. This results in a wave of open 38. When this wave of repolarization reaches the axon terminal, the voltage-gated calcium channels 39. is released from synaptic vesicles and is pumped out of the neuron. 40. Synaptic vesicles slop releasing the and the signal ends. 41. Following repolarization, some potassium channels close slowly resulting in voltage-gated sodium channels reset. 42. At this point, the open. strong stimulus period has ended and a new action potential ean be generated with a 43. A stronger stimulus is required because the neuron is hyperpolarized, requiring more EPSPs fo reach threshold during the period 43. A stronger stimulus is required because the neuron is hyperpolarized, requiring more EPSPs to reach threshold during the period. 44. return the neuron to resting ionic conditions and resting membrane potential is achieved.


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17. Nerve impulses in the synapse start with neurotransmitters released by presynaptic neurons.

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