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?
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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?
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- 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?In the laboratory, researchers can apply an electrical stimulus at any point along the axon, making action potentials travel in both directions from the point of stimulation. An action potential moving in the usual direction, away from the axon hillock, is said to be traveling in the orthodromic direction. An action potential traveling toward the axon hillock is traveling in the antidromic direction. If we started an orthodromic action potential at the axon hillock and an antidromic action potential at the opposite end of the axon, what would happen when they met at the center? Why?Describe the nature of the generator potential and explain its relationship to stimulus intensity and to frequency of action potential production.
- During the refractory period a) if a neuron reaches threshold the action potential goes to completion b) No stimulus of any strength will trigger a new action potential c) It is possible to trigger a new action potential but only with an unusually strong stimulus d) The signal grows weaker with distance e) The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to thresholdIn the knee jerk, contraction of quadriceps is accompanied by relaxation of the opposing flexor muscles. The contraction of quadriceps is mediated by a monosynaptic reflex (as stated above), and the relaxation of the antagonists is due to a dual connection reflex. The relaxation of antagonists is mediated by an inhibitory transmitter released by interneurones - these are called the la inhibitory interneurones, How do we name a dual connection reflex? monosynaptic disynaptic tricynaptic polysaccharideFigure Ql shows the typical electrical recording of movement artifacts during the resting potential and also the action potential when an adequate stimulus is delivered. Potential overshoot (, > 0) Movement artifact Action potential -80 Stimulus artifact Resting potential Figure Ql In your own words, discuss the phenomena occur during the resting state and active state until the equilibrium potential is established. (a) Membrane potential (m), mV
- The difference between the channels along the axon and the channels in the axon terminal is that? a) axon channels are voltage-gated sodium channels and axon terminal channels are voltage-gated calcium channels b) there is no difference c) axon channels are voltage-gated sodium channels and axon terminal channels are ligand- gated sodium channelsWhat happens when the response produced by the effector causes a decrease in the magnitude of the stimulus that triggered the sequence of events?Consider three alpha-motor neurons of different sizes: small, medium and large. All three neurons receive input from the same excitatory interneuron. When the interneuron fires action potentials at low frequency, only one alpha motor neuron fires action potentials. As the action potential frequency of the interneuron increases, two alpha-motor neurons are recruited, and at maximum frequency, all three are recruited. In what order would the three alpha-motor neurons have been recruited? Large first, then medium, then small. Small first, then medium, then large. Medium first, then small, then large. Medium first, then large, then small.
- What is/are true statements about Action Potentials? Select all that apply. Group of answer choices: A. action potentials propagate down axons B. nformation is coded through the frequency of action potentials C. action potentials are slower in myelinated axons D. action potentials vary depending on the strength of the stimulusWhat is/are true statements about Action Potentials? Select all that apply. Group of answer choices: A. action potentials propagate down axons B. information is coded through the frequency of action potentials C. action potentials are slower in myelinated axons D. action potentials vary depending on the strength of the stimulusIn an experiment, it was determined that the motor (effector) neuron for muscle fibre 1 had a threshold level of -5 mV. The motor (effector) neuron for muscle fibre 2 had a threshold level of -16 mV. An electrical probe was used to stimulate these two effector neurons of the muscle fibres. Which of the following rows correctly identifies the reaction of each muscle fibre based on the applied stimulus voltage? Select one: а. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 -10 mV Contracted Relaxed b. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 -20 mV Relaxed Contracted С. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 - 10 mV Relaxed Contracted d. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 - 20 mV Contracted Relaxed