8. Use diagram 136 tð answer the threshold level Fig 136 Dendrite Axon Neuron Neuron Neuron a. Neuron W will also be stimulated b. Neurons W and Y will both be stimulated Synapse Synapse 2 Y c. Acetylcholine will move across synapse 2 d. Acetylcholine will move across synapse 1 and 2

21. How does partial damage to the neuronal membrane lead to excessive amounts of neurotransmitter release? a. Sodium can freely enter the cell to depolarize it b. Potassium can freely enter the cell to depolarize it c. Chloride can freely exit the cell to depolarize it d. GABA receptors become blocked, preventing proper suppression e. Dopamine receptors become activated, exciting the neuron f. None of the above

Please answer question 2

4,5,6 and 7 if possible

(f) Parts of a Neuron A Axon (initial B segment) G H C D | Synapse: The region where an axon terminal communicates with its postsynaptic target cell E F Output signal 02019 Person Education, Inc. Use the list below to identify D in the figure. postsynaptic neuron, integration, cell body, axon, action potential, presynaptic axon terminal, myelin sheath, synaptic vesicle, dendrites, input signal, Node of Ranvier, postsynaptic dendrite, nucleus, integration, axon hillock, voltage gated channel Synaptic cleft J

4.3. After the rising phase, which ion channel is responsible for action potential returning to its resting V and why? Na channels, because positive Na* ions are at higher concentration outside the axon than inside, and so they enter the axon and raise V O Na* channels, because positive Na* ions are at higher concentration inside the axon than outside, and so they leave the axon and raise V, m O K* channels, because positive K* ions are at higher concentration outside the axon than inside, and so they enter the axon and raise Vm U K* channels, because positive K* ions are at higher concentration inside the axon than outside, and so they leave the axon and lower Vm

1. What is action potential? Please describe the ionic mechanisms of depolarization and repolarization phase of action potential in the squid giant axon. please write more and more

Which statement is true regarding chemical neurotransmission? O An IPSP closer to the soma will diminish the effects of an EPSP on a dendrite Chemical neurotransmission is mediated by gap junctions All neurotransmitter receptors are located on the postsynaptic cell membrane Neurotransmitters remain in the synaptic cleft indefinitely

Place the steps of the action potential in order. 3. a brief reversal of membrane potential that travels along the axon mechanism that restores the resting membrane voltage and intracellular ionic concentrations 2.C reversal of the resting potential due to an influx of sodium ions 1. period during which potassium ions are diffusing out of the neuron because of a change in membrane permeability

Expression of which of the following lowers the threshold for firing action potentials? O A. Voltage-dependent K* channels OB. Na+, K+-ATPase OC. GABAA receptors OD. CI channels O E. Voltage-dependent Na* channels