Temporal summation refers to: summation of action potentials in the temporal cortex. summation of postsynaptic potentials on a neuron occurring closely together in time. summation of postsynaptic potentials at different places on a neuron at the same time. summation of postsynaptic potentials in the temporal cortex.
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- Stellate cells initially process sensory input to the cortex, whereas pyramidal cells send fibers from the cortex to terminate on efferent motor neurons. (True or false)Excitatory neurons A and B both synapse with neuron C. Neuron A releasesa neurotransmitter, and neuron B releases the same type and amount ofneurotransmitter plus a neuromodulator that produces EPSPs in neuron C.Action potentials produced in neuron A alone can result in action potentialproduction in neuron C. Action potentials produced in neuron B alone alsocan cause action potential production in neuron C. Which results in moreaction potentials in neuron C, stimulation by only neuron A or stimulationby only neuron B? Explain.Two separate post-synaptic interneurons receive synaptic potentials from afferent neurons in the periphery. The dendrites of one these interneurons receive an excitatory post-synaptic potential (EPSP) and an inhibitory post-synaptic potential (IPSP) of equal magnitude at the same time. The dendrites of the other interneuron receive one excitatory post-synaptic potential that is the same sized as the EPSP and IPSP received by the other interneuron
- nswer After an action potential is generated in a neuron, it travels to the end of the axon. Explain how the absolute refractory period prevents the action potential from travelling back to the cell body, and why it does not prevent the action potential from moving down to the end of the axon. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph 启 Q Arial 10pt A Ix ...Synaptic transmission depends upon :- a-direct transmission of impulses from the presynaptic neuron to the postsynaptic neuronb- diffusion of neurotransmitters from synaptic knobs into the soma and dendrites of postsynaptic neuronsc- presence of voltage-gated Ca ++ channels in membrane of synaptic knobsd- presence of voltage-gated Ca ++ channels in the subsynaptic membraneAn individual diagnosed with CMT has difficulty holding a cup because: a. The myelin in the motor neurons is damaged thereby preventing an impulse frommoving along the axonb. The myelin in the sensory neurons is damaged thereby preventing an impulse frommoving along the axonc. The dendrites in the motor neurons are damaged thereby preventing an impulse frommoving along the axond. The dendrites in the sensory neurons are damaged thereby preventing an impulse frommoving along the axon
- a channel can be gated mechanically, voltage or by a ligand. When you hear a sound all three of these type channels are being utilized. Explain generally where/how each of these channels are being utilized starting from hearing the sound, through travelling down a nerve to transmission to another nerve.In terms of function when a presynaptic neuron receiving input from a nearby inhibitory neuron, it can be inferred that the both neurons firing won't be synchronized activation of the inhibitory neuron is nullified activation of the presynaptic neurotransmitter release is enhanced this type of interaction represents a regulatory input of neuronal activationDuring the relative refractory period: Can select more than one K+ channels are open. Na+ channels are inactivated. It is impossible to fire a subsequent action potential. It is more difficult, but possible, to elicit another action potential.
- What is an example of asituation in which the neuroncell body is located in a part ofthe body and its axonalterminal portion is in anotherdistant part of the body? Whydoes this happen?ахon transmits information away from the cell body (centrifugal) and that ends by the terminal arborization. Only axons are surrounded by a myelin sheath. to the cell body (centripetal) and the axon that PROBI NG Ithe ACTIVITY What are the structural constituents of the gray matter, the white matter, and the nerve? Draw a neuron then use the different documents of the activity to determine, on the figure, t location of each part of the neuron in the nervous system. Using docs a, b, and c, draw and label a transverse section of the spinal cord, a cell body, a transverse section of a nerve.Why is the action potential conducted in only one direction in a neuron? Comments : Best of your knowledege for grasp the concept well