Which of the following does NOT contribute to the built in "safety factor" at the neuromuscular junction, whereby an action potential in the motor neuron almost always causes an AP in the muscle fiber High concentration of nicotinic acetylcholine receptors at the crests (top) of the postsynaptic folds High concentration of voltage-gated sodium channels in the troughs (bottom) of the postsynaptic folds OPrecise alignment of presynaptic release zones opposite the crests of the postsynaptic folds High concention of acetylcholinesterase in the synaptic cleft
Q: b) scorpion, he felt numbness in his fingers due to the neurotoxin produced by the scorpion which is…
A: Scorpion Venom would affect the duration and amplitude of an action potential.
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A: Action potential When nerve cell respond to a stimulus, it generates electric impulse which travel…
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A: Ans- e. depolarization by allowing Na+ ions to enter the muscle fiber.
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A: These are the events that occur during the nerve action potential and M-current is the…
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Q: ach
A: B. ACH or Acetylcholine is the only neurotransmitter that is present in the somatic muscular…
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A: The nicotinic acetylcholine receptor is a transmembrane allosteric protein that opens an inherent…
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A: All of the following are directly involved in synaptic transmission except
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A: Answer : Motor neuron , Sodium Ion
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Q: A K FL
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A: An action potential occurs when the membrane potential of specific cell location rapidly rises and…
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A: In general, nerves and muscles generate and transfer electrical signals and these excited signals…
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A: Hi! As you have posted multiple questions, I will be answering the first question for you. If you…
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- The disease poliomyelitis (po′le-o-mi′˘e-li′tis) destroys motor neurons, causingloss of muscle function and even flaccid paralysis. Some patients recoverbecause axon branches form from the remaining motor neurons. Thesebranches innervate the paralyzed muscle fibers to produce motor unitswith many more muscle fibers than usual. How does this reinnervation ofmuscle fibers affect the degree of muscle control in a person who hasrecovered from poliomyelitis?What special characteristics of the presynaptic neuron (motor neuron) and motor end-plate (postsynaptic membrane in the NMJ) make it possible (and likely) that the threshold for an action potential will be reached in the muscle fiberWe've referred to alpha-motor neurons as the "decision making centre" for whether or not a muscle fibre contracts. Which of the following statements are true with regards to his concept? Select all that apply. O Alpha motor neurons receive input from many different sources, the balance of which determines whether or not the alpha-motor neuron fires an action potential O Alpha motor neurons are involved in conscious decision making in our central nervous system for planning and executing movements O When an action potential is initiated in an alpha-motor neuron, we are guaranteed an action potential in the muscle fibre, and hence contraction of that fibre. This means the muscle itself does not determine whether or not it contracts O Alpha motor neurons report information on where we are in space (proprioception) back to the central nervous system
- Acetylcholine is necessary for the depolarization of skeletal muscle cells. Which of the following statements concerning acetylcholine action is true. O acetylcholine is released in quanta from the sarcolemma membrane by exocytosis O acetylcholine is released in quanta from the postsynaptic membrane by exocytosis O acetylcholine enters the caveoli to depolarize the sarcolemma acetylcholine enters clathrin -coated vesiclec prior to its degradation by O acetylcholine attaches to transmitter-gated ion channels of the sarcolemma . During an action potential, depolarization occurs because: Channels for sodium ions in the cell membrane open and sodium flows into the cell O Both channels for sodium and potassium are closed O Channels for potassium ions in the cell membrane open and potassium leaves he cell Sodium potassium pump retums sodium to the outside of the cell and potassium to the inside Stroke occurs when a blood clot enters the cerebral ciruculatin, blocking an artery and causing…Succinylcholine act as adepolarising agent that prevents repolarization of the somatic motor neuron. Thus, no further ACh is released until drug is cleared. Name another site within the MNJ we could target to prevent muscle contraction, and explain why this would work.Both the withdrawal reflex and the Golgi tendon reflex involve sensory signals that ultimately control the same type ofmotor neurons and both are protective. Explain how one reflex can cause muscle contraction while the other causes musclerelaxation.
- The discharge from Golgi tendon organs initiated by excessive stretch ofa skeletal muscle produces :-a- inhibition of α -motor neurons of antagonistic musclesb- inhibition of γ-motor neurons of antagonistic musclesc- inhibition of α -motor neurons of the same muscled- stimulation of γ-motor neurons of the same muscleRising of REM in endplate potential of skeletal muscle fiber by chemical stimulation to threshold point. Discuss all event lead for that.Rising of REM in endplate potential of skeletal muscle fiber by chemical stimulation to threshold point . Discuss all event for that
- Why is it important to remove acetylcholine from its binding to acetylcholine receptors once the neural stimulus ends? What can be the possible consequence of the non-removal of acetylcholine to the skeletal muscle fiber?Muscle spindle structures consist of: Extrafusal muscle fibers and gamma motor neurons Extrafusal muscle fibers and alpha motor neurons Golgi tendon organs and gamma motor neurons Intrafusal muscle fibers and gamma motor neuronsA muscle cell contains acetylcholine receptors that act as ligand-gated cation channels,and it also contains voltage-gated Na+ channels of the type found in neurons. Intheory, could a muscle cell get away with having only acetylcholine-gated cationchannels, which would serve the dual purpose of receiving neurotransmitter signalsand propagating action potentials? Why or why not?