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Since all APs generated by a given nerve fiber have the same magnitude, how does the CNS “know” whether a stimulus is strong or weak?
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- Which of the following is true regarding the difference between graded and action potentials? a.) Action potential occur only when the surface of the neuron is myelinated, but graded potentials occur in both in both myelinated and non-myelinated neurons. b.) The magnitude of action potential depends on the magnitude of the stimulus, whereas graded potentials are all or none. c.) The magnitude of graded potential depends on the magnitude of the stimulus, whereas action potentials are all or none.Applying a pressure stimulus to the fluid-filled capsule of an isolated Pacinian corpuscle causes a brief burst of action potentials in the afferent neuron, which ceases until the pressure is removed, at which time another brief burst of action potentials occurs. If an experimenter removes the capsule and applies pressure directly to the afferent neuron ending, action potentials are continuously fired during the stimulus. Explain these results in the context ofadaptation.How do we distinguish a strong stimulus from a weak one when the information about both stimuli is relayed by action potentials that are all the same amplitude?
- 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 interneurona) Which letter represents structure that is a receptor for sensory info? b) Which letter represents a skeletal muscle? c) Which letter represents structure that transmits info to CNS d) Which letter represents structure that is known as cell body of a sensory neurone? e) Which letter represents structure that is cell body of a post-ganglionic sympathetic neuron?Does the action potential in a single axon increase in amplitude when the stimulus amplitude is increased? Does the amplitude of the CAP increase because more fibers are firing, or the amplitude of the action potentials from single fibers are increasing, or a combination of both?
- Assume that two nerve fibers have the same diameter, but one ismyelinated and the other is unmyelinated. The conduction of anaction potential is most energy-efficient along which type of fiber?(Hint: Think about the required ATP.)Compare the following:(a) Central neural system (CNS) and Peripheral neural system (PNS)(b) Resting potential and action potential(c) Choroid and retinab) You are having a shower with warm water, and all of a sudden, the water turns ice cold! How do you think your temperature sensory neurons code this very noticeable and strong stimulus? a) They produce larger EPSPS at the same rate as under the warm water condition. b) They produce larger, but the same number of, action potentials as under the warm water condition. c) They produce smaller EPSPS at a higher rate than under the warm water condition. d) They produce the same number and size action potentials that travel faster down the neurons than under the warm water condition. e) They produce more action potentials of the same size as under the warm water condition
- Cell bodies of UMN that synapse on LMN lie in all of these areas EXCEPT a) Medulla b) Thalamus c) Pre-motor cortex Pons d) Primary motor cortexWhich of the following is the most direct result of depolarizingthe presynaptic membrane of an axon terminal?(A) Voltage-gated calcium channels in the membrane open.(B) Synaptic vesicles fuse with the membrane.(C) Ligand-gated channels open, allowing neurotransmittersto enter the synaptic cleft.(D) An EPSP or IPSP is generated in the postsynaptic cell.Using the neurons below, how can you decrease the connection strength (amplitude of EPSP) onto the test cell below? You can only change the properties of the blue neuron. How could you change the properties of the blue neuron to increase the connection strength onto the test cell? What type of plasticity is this? Now, briefly explain how the properties of synaptic plasticity could result in “learned” behaviors such as stopping at a stop sign while driving.