The intracellular resistance of a nerve cell is 8.2*106 Ω/cm (ri). Resistance of the cell membrane...
The intracellular resistance of a nerve cell is 8.2*106 Ω/cm (ri). Resistance of the cell membrane is 1.5*104 Ωcm and capacitance 12 nF/cm (cm). Calculate the intracellular resistance and resistivity and membrane capacitance of the axon.
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The intracellular resistance of a nerve cell is 8.2*106 Ω/cm
(ri). Resistance of the cell membrane...
When a nerve cell is stimulated electrically, mechanically, or chemically, the permeability of the cell membrane...
When a nerve cell is stimulated electrically, mechanically, or chemically, the permeability of the cell membrane changes and sodium ions (Na+) can diffuse more readily into the cell. If 1.5 x 106 Na+ ions move through the membrane in 5.0 ms, what is the corresponding electric current?
The resistor-capacitor network model we developed in Lecture (see figure below where it is shown only...
The resistor-capacitor network model we developed in Lecture
(see figure below where it is shown only for the myelinated case)
for the transmission of signals in nerve axons can actually be
applied to both unmyelinated and myelinated nerve cells to estimate
the propagation speed of a nerve impulse. In the unmyelinated case
the 6-7 nm thick plasma membrane (the lipid bilayer) acts both as a
(very thin) dielectric layer forming a capacitor between the inside
of the axon and the...
please answer question 8-13 This is the prior information: Nerve impulses are electrical currents in the...
please answer question 8-13
This is the prior information: Nerve impulses are electrical
currents in the form of “ionic flows.” Therefore the electrical
properties of the axon are important to understand in order to
understand the flow of electrical impulses. In this test, you will
explore the capacitance and resistivity of an axon of a nerve cell.
For this test, the axon will be treated as a CYLINDER of arbitrary
length “L” and radius “a” that is filled with a...
The membrane of the axon of a nerve cell is a thin cylindrical shell of radius...
The membrane of
the axon of a nerve cell is a thin cylindrical shell of radius r-
10 m, length L 0.48 m, and thickness d 108 m. The membrane has a
positive charge on one side and a negative charge on the other, and
acts as a parallel plate capacitor of area A 2arL and separation d.
Its dielectric constant is about 7.
Tipler6 24,P.067. 1 2 3 The membrane of the axon of a nerve cell is a...
1. An average nerve axon is about 5x10-6m in radius, and the axoplasm that composes the...
1. An average nerve axon is about 5x10-6m in radius, and the axoplasm that composes the interior of the axon has a resistivity of about 2 Ω ⋅m. What is the resistance of just 2-cm length of this axon? Provide your answer in mega-ohms (1 mega-ohm = 106 ohms or "millions of ohms"). (Note, this value is so large -- it corresponds to the resistance of tens of thousands of miles of the thinnest copper wire normally manufactured(!) -- that it...
4. The cell membrane can be modeled like an electrical circuit. The phospholipid mem- brane can...
4. The cell membrane can be modeled like an electrical circuit. The phospholipid mem- brane can be represented by a capacitance CM. Each ion gradient can be represented as a current -GiVi where i represents a given ion, I is current, V is voltage, and G is conductance. (As a reminder, conductance is the inverse of resistance.) First, consider a model with one ion: (a) Find the transfer function for the figure shown above (b) In the 1950's Alan Hodgkin...
3) Electrical model of a cell membrane Consider a piece of cell membrane. The membrane has...
3) Electrical model of a cell membrane Consider a piece of cell membrane. The membrane has a specific conductivity of Om = 10-10 (12 cm)', a dielectric constant Em = 8 and thickness dm = 7.5 nm. On both sides of the membrane are two boundary layers with equal specific conductivity Op = OL = 102 (2 cm)-1. The thickness of these layers is dp = 50 nm and di = 100 nm and their capacitance is negligible. a) What...
An axon is a long, slender projection of a nerve cell, or neuron e , that...
An axon is a long, slender projection of a nerve cell, or neuron e , that typically conducts electrical impulses e away from the neuron's cell body e . Capacitance (C) is the ability of a system to store an electric charge. In this activity, you'll use information given about these fascinating structures to calculate the capacitance of an axon. Αxon Axon terminal Dendrite Node of Ranvier Soma Axon Schwann cell Myelin sheath Nucleus plasma membrane cytoplasm, a conducting liquid...
1. The headlights on an automobile are 125 cm apart. At what distance will the lights appear to b...
1. The headlights on an automobile are 125 cm apart. At what distance will the lights appear to be just resolvable to a person whose nocturnal pupils are 4.5 mm in 2. Assume the range of pupil variation during adaptation of a normal eye is from 2.0 to 7.1 mm. What is the corresponding range of distances over which it can detect 3. Two stars make an angle of 1 x 10-3 radians at the eye of an observer. A...
Sorry for posting more than one question -- someone said they needed the rest of the...
Sorry for posting more than one question -- someone said they
needed the rest of the questions to better understand how to answer
one!
Question 1 1 pts Using the data provided in the table below for an "average" axon, we found in the previous lab and in the pre-lab questions for this lab) that the membrane resistance and membrane capacitance were about 44M0 = 44 x 102 and 60pF = 60 x 10-12 F, respectively, for a membrane segment...
The resistor-capacitor network model we developed in Lecture
(see figure below where it is shown only for the myelinated case)
for the transmission of signals in nerve axons can actually be
applied to both unmyelinated and myelinated nerve cells to estimate
the propagation speed of a nerve impulse. In the unmyelinated case
the 6-7 nm thick plasma membrane (the lipid bilayer) acts both as a
(very thin) dielectric layer forming a capacitor between the inside
of the axon and the...
please answer question 8-13
This is the prior information: Nerve impulses are electrical
currents in the form of “ionic flows.” Therefore the electrical
properties of the axon are important to understand in order to
understand the flow of electrical impulses. In this test, you will
explore the capacitance and resistivity of an axon of a nerve cell.
For this test, the axon will be treated as a CYLINDER of arbitrary
length “L” and radius “a” that is filled with a...
The membrane of
the axon of a nerve cell is a thin cylindrical shell of radius r-
10 m, length L 0.48 m, and thickness d 108 m. The membrane has a
positive charge on one side and a negative charge on the other, and
acts as a parallel plate capacitor of area A 2arL and separation d.
Its dielectric constant is about 7.
Tipler6 24,P.067. 1 2 3 The membrane of the axon of a nerve cell is a...
4. The cell membrane can be modeled like an electrical circuit. The phospholipid mem- brane can be represented by a capacitance CM. Each ion gradient can be represented as a current -GiVi where i represents a given ion, I is current, V is voltage, and G is conductance. (As a reminder, conductance is the inverse of resistance.) First, consider a model with one ion: (a) Find the transfer function for the figure shown above (b) In the 1950's Alan Hodgkin...
3) Electrical model of a cell membrane Consider a piece of cell membrane. The membrane has a specific conductivity of Om = 10-10 (12 cm)', a dielectric constant Em = 8 and thickness dm = 7.5 nm. On both sides of the membrane are two boundary layers with equal specific conductivity Op = OL = 102 (2 cm)-1. The thickness of these layers is dp = 50 nm and di = 100 nm and their capacitance is negligible. a) What...
An axon is a long, slender projection of a nerve cell, or neuron e , that typically conducts electrical impulses e away from the neuron's cell body e . Capacitance (C) is the ability of a system to store an electric charge. In this activity, you'll use information given about these fascinating structures to calculate the capacitance of an axon. Αxon Axon terminal Dendrite Node of Ranvier Soma Axon Schwann cell Myelin sheath Nucleus plasma membrane cytoplasm, a conducting liquid...
1. The headlights on an automobile are 125 cm apart. At what distance will the lights appear to be just resolvable to a person whose nocturnal pupils are 4.5 mm in 2. Assume the range of pupil variation during adaptation of a normal eye is from 2.0 to 7.1 mm. What is the corresponding range of distances over which it can detect 3. Two stars make an angle of 1 x 10-3 radians at the eye of an observer. A...
Sorry for posting more than one question -- someone said they
needed the rest of the questions to better understand how to answer
one!
Question 1 1 pts Using the data provided in the table below for an "average" axon, we found in the previous lab and in the pre-lab questions for this lab) that the membrane resistance and membrane capacitance were about 44M0 = 44 x 102 and 60pF = 60 x 10-12 F, respectively, for a membrane segment...
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