Consider a myelinated axon having Em of -80 mV. Threshold to elicit an action potential is -40 mV. An action potential (100 mV amplitude, measured from Em to peak) arrives at the first node of Ranvier. Local current flowing ahead of the spike reaches the second node, the distance being x = 0.25A. Calculate the magnitude of the depolarization caused by local current reaching the second node using the equation: V = Voe A. 45 mV B. 78 mV C.65 mV D. 100 mv

Consider a myelinated axon having Em of -80 mV. Threshold to elicit an action potential is -40 mV. An action potential (100 mV amplitude, measured from Em to peak) arrives at the first node of Ranvier. Local current flowing ahead of the spike reaches the second node, the distance being x = 0.25A. Calculate the magnitude of the depolarization caused by local current reaching the second node using the equation: V = Voe A. 45 mV B. 78 mV C.65 mV D. 100 mv

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

A typical pacemaker delivers 60 electrically stimulating pulses per minute to a heart, where each 3.5 volt pulse lasts 0.4 milliseconds. The resistance of the heart tissue between the pacemaker electrodes is typically about 600 ohms. If the pacemaker's battery pack stores about 18 kilojoules of chemical energy (the equivalent of about 2 AA batteries) and converts its energy to electrical energy in the heart tissue with an efficiency of 35%, about how long will the battery pack last? (Hint: the answer is 24 years)
A 2.00-nF capacitor with an initial charge of 4.01 µC is discharged through a 1.02-kn resistor. (a) Calculate the current in the resistor 9.00 us after the resistor connected across the terminals of the capacitor. (Let the positive direction of the current be define such that > 0.) mA (b) What charge remains on the capacitor after 8.00 us? (c) What is the (magnitude of the) maximum current in the resistor?
The largest operating wind La generator in the world has a rotor diameter of almost 100m. This nits generator can deliver 3 3.1 MW of power. Suppose you connect adl 3.0 K resistor, a 4.0K resistor, and a 5.ok resistor in parallel- klhat potential difference must be applied across these resistors) in order to dissipate power w 1.00 percent of the Jock equal to power provided by the generator? Show all working step-by-step gat2 word stz
A 2.00-nF capacitor with an initial charge of 5.69 μC is discharged through a 1.07-k resistor. (a) Calculate the current in the resistor 9.00 µs after the resistor is connected across the terminals of the capacitor. (Let the positive direction of the current be define such that. mA (b) What charge remains on the capacitor after 8.00 µs? μC (c) What is the (magnitude of the) maximum current in the resistor? > 0.)
A single ion channel is selectively permeable to K* and has a resistance of 2.40 G2. During an experiment, the channel is open for approximately 1.80 ms while the voltage across the channel is maintained at +80.5 mV with a patch clamp. How many ions, N, travel through the channel? N = K+ ions
A 2.00-nF capacitor with an initial charge of 5.99 µC is discharged through a 2.42-k resistor. (a) Calculate the current in the resistor 9.00 µs after the resistor is connected across the terminals of the capacitor. (Let the positive direction of the current be define dQ such that dt > 0.) 192.757 X This is the correct magnitude of the current mA (b) What charge remains on the capacitor after 8.00 µs? 9.329e-7 X What is the equation describing the time dependence of the charge on a capacitor that is being discharged in an RC circuit? µC (c) What is the (magnitude of the) maximum current in the resistor? 1.237 A
A 5 mF capacitor with an initial charge of 9.0 µC is discharged through a 1200 2 resistor. (a) Calculate the current through the resistor 15 us after the resistor is connected across the terminals of the capacitor. (b) What charge remains on the capacitor after 9 us? (c) What is the maximum current through the resistor? baraomo hoibege ot og
A 2.00-nF capacitor with an initial charge of 5.27 µC is discharged through a 2.47-k2 resistor. dQ (a) Calculate the current in the resistor 9.00 µs after the resistor is connected across the terminals of the capacitor. (Let the positive direction of the current be define such that > 0.) dt (b) What charge remains on the capacitor after 8.00 µs? (c) What is the (magnitude of the) maximum current in the resistor? A
In a certain article, laser therapy was discussed as a useful alternative to drugs in pain management of chronically ill patients. To measure pain threshold, a machine was used that delivered low-voltage direct current to different parts of the body (wrist, neck, and back). The machine measured current in milliamperes (mA). The pretreatment experimental group in the study had an average threshold of pain (pain was first detectable) at ? = 3.19 mA with standard deviation ? = 1.03 mA. Assume that the distribution of threshold pain, measured in milliamperes, is symmetric and more or less mound-shaped. (Round your answers to two decimal places.) (a) Use the empirical rule to estimate a range of milliamperes centered about the mean in which about 68% of the experimental group will have a threshold of painfrom mA to mA(b) Use the empirical rule to estimate a range of milliamperes centered about the mean in which about 95% of the experimental group will have a threshold of painfrom mA to…
A 2.00-nF capacitor with an initial charge of 4.93 µC is discharged through a 1.93-k resistor. dQ (a) Calculate the current in the resistor 9.00 µs after the resistor is connected across the terminals of the capacitor. (Let the positive direction of the current be define such that dt 1.72 The current through the resistor is considered to be negative, so that I = dQ/dt. mA (b) What charge remains on the capacitor after 8.00 µs? μC (c) What is the (magnitude of the) maximum current in the resistor? A > 0.)