Potential Difference Across Axon Membrane The axoplasm of an axon has a resistance Rax. The axon's membrane has both a resistanc
e (Rmem) and a capacitance (Cmem). A single segment of an axon can be modeled by a circuit with Rmem and Cmem in parallel with each other and in series with an open switch, a battery, and Rax. Imagine the voltage of the battery is ΔV. Part A We can model the firing of an action potential by the closing of the switch, which completes the circuit. Immediately after the switch closes, what is the potential difference across the membrane of this single segment?
1 answer:
Answer:
<em>check the diagram in the attachment below.</em>
After the switch closes, the voltage across the membrane will be zero. It is so due to the fact that the capacitor will be short circuited.
Explanation:
question
Potential Difference Across Axon Membrane The axoplasm of an axon has a resistance Rax. The axon's membrane has both a resistance (Rmem) and a capacitance (Cmem). A single segment of an axon can be modeled by a circuit with Rmem and Cmem in parallel with each other and in series with an open switch, a battery, and Rax. Imagine the voltage of the battery is ΔV. Part A We can model the firing of an action potential by the closing of the switch, which completes the circuit. Immediately after the switch closes, what is the potential difference across the membrane of this single segment?
ANSWER;
After the switch closes, the voltage across the membrane will be zero. It is so due to the fact that the capacitor will be short circuited.
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Answer:
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Explanation:
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a) , downward
b) , upward
c) , downward
Explanation:
a)
The gravitational force of an object (also known as weight of the object) is the attractive force with which the object is pulled towards the Earth's centre.
For an object near the Earth's surface, the magnitude of the gravitational force is given by the equation
where
m is the mass of the object
g is the acceleration due to gravity
In this problem, we have:
is the mass of the electron
is the acceleration due to gravity
Therefore, the gravitational force on the electron is:
And the direction is downward, towards the Earth's centre.
b)
The electric force on a charged particle is the force produced by the presence of an electric field.
In particular, this force is:
- Repulsive (away from the source of the field) if the charge has the same sign of the charge source of the field
- Attractive (towards the source of the field) if the charge has opposite sign to the charge source of the field
The magnitude of the electric force is given by:
where
q is the charge of the particle
E is the strength of the electric field
In this problem:
is the charge of the electron
is the strength of the electric field
Substituting,
And since the electron has negative charge, the direction of the force is opposite to that of the electric field, so upward.
c)
When a charged particle is moving in a magnetic field, it experiences a force which is perpendicular to both the direction of motion of the charge and to the direction of the magnetic field.
The magnitude of this force is given by (if the charge moves perpendicular to the magnetic field)
where
q is the charge
v is the velocity of the particle
B is the strength of the magnetic field
In this problem:
is the charge of the electron
is the velocity
is the strength of the magnetic field
Substituting,
And the direction can be determined using the right-hand rule:
- Index finger: direction of velocity (eastward)
- Middle finger: direction of magnetic field (northward)
- Thumb: direction of force (upward) --> however the electron has negative charge, so the direction of the force is reversed --> downward