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Questions and Answers
What is the role of voltage in an electrical circuit?
What is the role of voltage in an electrical circuit?
According to Ohm's Law, what is the relationship between potential difference (V), current (I), and resistance (R) in a circuit?
According to Ohm's Law, what is the relationship between potential difference (V), current (I), and resistance (R) in a circuit?
What does current represent in an electrical circuit?
What does current represent in an electrical circuit?
What does Ohm's Law state about the relationship between current, resistance, and potential difference in a circuit?
What does Ohm's Law state about the relationship between current, resistance, and potential difference in a circuit?
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If 12.0 V is applied to an automobile headlight and 250 mA flows through it, what is the resistance of the headlight?
If 12.0 V is applied to an automobile headlight and 250 mA flows through it, what is the resistance of the headlight?
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What primarily determines the membrane potentials in cells?
What primarily determines the membrane potentials in cells?
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What will be measured if a voltmeter is used to measure voltage across the cell membrane (inside versus outside) of a cardiomyocyte?
What will be measured if a voltmeter is used to measure voltage across the cell membrane (inside versus outside) of a cardiomyocyte?
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What is the resting membrane potential caused by?
What is the resting membrane potential caused by?
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Which ion has a much higher concentration in the cytoplasm compared to the extracellular fluid?
Which ion has a much higher concentration in the cytoplasm compared to the extracellular fluid?
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What is the general rule regarding membrane potential?
What is the general rule regarding membrane potential?
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What is the equilibrium potential for a given ion?
What is the equilibrium potential for a given ion?
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What primarily determines the membrane potentials in cells?
What primarily determines the membrane potentials in cells?
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What primarily determines the membrane potentials in cells?
What primarily determines the membrane potentials in cells?
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Study Notes
Electrical Circuits
- Voltage plays a crucial role in an electrical circuit, enabling the flow of electric current.
- According to Ohm's Law, the relationship between potential difference (V), current (I), and resistance (R) is V = I × R.
- Current represents the flow rate of electric charge in a circuit.
Resistance and Voltage
- If 12.0 V is applied to an automobile headlight and 250 mA flows through it, the resistance of the headlight is 48 ohms (calculated using Ohm's Law).
Cell Membrane Potentials
- The membrane potential in cells is primarily determined by the concentration gradient of ions across the cell membrane.
- A voltmeter measures the voltage across the cell membrane (inside versus outside) of a cardiomyocyte.
- The resting membrane potential is caused by the concentration gradient of ions, particularly potassium (K+) and sodium (Na+) ions.
- Potassium ions have a much higher concentration in the cytoplasm compared to the extracellular fluid.
- The general rule regarding membrane potential is that a higher concentration of ions inside the cell results in a more negative resting membrane potential.
- The equilibrium potential for a given ion is the potential difference at which the tendency of the ion to diffuse down its concentration gradient is balanced by the electric force driving it in the opposite direction.
- The concentration gradient of ions across the cell membrane primarily determines the membrane potentials in cells.
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Description
Test your knowledge of membrane potential and voltage in biophysics with this quiz. Explore the concepts of electrical circuit, voltage, current flow, and resistance in the context of biophysics.
