see if ether will have an effect on eliciting an action potential which I believe that it will make it difficult. Curare is a well known plant extract that South American Indians used to paralyze their pray. It blocks synaptic transmission by preventing the flow of neural impulses from neuron to neuron (Laboratory Manual). I believe that the effect of curare eliciting an action potential will lead to curare not being able to act on an action potential because it will block and slow down the stimulation
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Blank docs 1 2 3 4 5 6 7 7 7 7 7 7 7 7 abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ 1. stimulus range: threshold = .8 v‚ max = 8.5 v 2. muscle response: twitch with 3 phases (latent‚ contraction‚ relaxation) 3. effects of increasing stim. Intensity on muscle force: forces increases then stays constant 1. Nervous Sys. I: Action Potential; Ion Channels; Membrane Potential 2. Nervoous Sys. II: Synaptic Potentials and Cellular Integration
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OUTLINE I. Nervous System = 2 Parts A. Central Nervous System (CNS) 1. Brain 2. Spinal Cord B. Peripheral Nervous System (PNS) 1. Nerves to parts of the body 2. Nerves from parts of the body C. Functions 1. Sensory a. receptors for stimuli (receive stimulus) b. peripheral nerves (carry impulses to CNS) c. activities monitored 1) light intensity (visual) 2) sound intensity (auditory) 3) temperature 4) oxygen concentration 5) internal fluid conditions 2. Motor a. peripheral nerves
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system. 12-2 Sketch and label the structure of a typical neuron‚ describe the functions of each component‚ and classify neurons on the basis of their structure and function. 12-3 Describe the locations and functions of the various types of neuroglia. 12-4 Explain how the resting potential is created and maintained. 12-5 Describe the events involved in the generation and propagation of an action potential. 12-6 Discuss the factors that affect the speed with which action potentials are propagated
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a flat line. 2. What was the threshold voltage‚ or the voltage at which you first saw an action potential? 3.0 V 3. How does this tracing compare to the one that was generated at the threshold voltage? Very similar except that it’s peak is a little higher while it drops a little more as well. 4. What reason can you give for the change? The higher the voltage the more "excitable" the signal gets. 5. Record this maximal voltage here: 4.5 V Activity 2: Mechanical Stimulation
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interact with the sodium ions inside the myelinated internodes and subsequently with the sodium ions in the next node of Ranvier‚ vastly speeding up the process of propagating the action potential5. This process can be modeled by a partial differential equation obtained from the Cable theorem and describes the potential across the myelin layer‚ found in Equation 1
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ACTIVITY 1: The Resting Membrane Potential Answers 1. The nervous system contains two general types of cells: neuroglia cells and a. nerves. b. cell bodies. c. neurons. d. nephrons. 2. The resting membrane potential of the neuron in this lab under the control conditions was _______ mV. 3. True or False: For most neurons‚ the concentration of Na+ and K+ ions inside and outside the cell are the primary factors that determine the resting membrane potential. 4. Explain why increasing the
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"equilibrium potential". Why is the resting potential closer to the potassium equilibrium potential (EK+) than the sodium potential (ENa+)? The equilibrium potential is the point at which the force exerted on an ion by electrostatic and concentration gradient forces are balanced‚ and there is no net movement of that ion. The resting potential is closer to EK+ than ENa+ because the cell membrane is more permeable to potassium than sodium. 2. How would
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Contribution of Nav1.8 Sodium Channels to Action Potential Electrogenesis in DRG Neurons J Neurophysiol 86:629-640‚ 2001. ; You might find this additional info useful... This article cites 38 articles‚ 24 of which you can access for free at: http://jn.physiology.org/content/86/2/629.full#ref-list-1 This article has been cited by 68 other HighWire-hosted articles: http://jn.physiology.org/content/86/2/629#cited-by Updated information and services including high resolution figures‚ can be found at:
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Eliciting (Generating) a Nerve Impulse 1. Why don’t the terms depolarization and action potential mean the same thing? Depolarization has to do with surfaces becoming more negative or positive and reaches a certain point called a threshold. When the threshold is reached‚ an action potential is initiated. 2. What was the threshold voltage in Activity 1? The threshold voltage in Activity 1 was 3.0. 3. What was the effect of increasing the voltage? How does this change correlate to changes
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