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Questions and Answers
What defines the ability of a neuron to respond to a stimulus and form an action potential?
What defines the ability of a neuron to respond to a stimulus and form an action potential?
- Membrane potential
- Conductivity
- Resting membrane potential
- Excitability (correct)
Which of the following correctly describes the phenomenon of membrane potential?
Which of the following correctly describes the phenomenon of membrane potential?
- It represents the electrical charge difference across the plasma membrane. (correct)
- It only occurs in muscle cells.
- It is constant regardless of ion distribution.
- It is solely determined by the action potential.
What is the resting membrane potential (RMP) of a typical resting neuron?
What is the resting membrane potential (RMP) of a typical resting neuron?
- +30 millivolts (mV)
- -70 millivolts (mV) (correct)
- 0 millivolts (mV)
- -50 millivolts (mV)
Which physiological characteristic allows neurons to transmit action potentials along an axon?
Which physiological characteristic allows neurons to transmit action potentials along an axon?
What is primarily responsible for the electrical charge difference across the plasma membrane of most body cells?
What is primarily responsible for the electrical charge difference across the plasma membrane of most body cells?
What primarily contributes to the negative charge inside a resting neuron?
What primarily contributes to the negative charge inside a resting neuron?
In a typical resting neuron, which ion concentration is higher in the extracellular fluid compared to the cytosol?
In a typical resting neuron, which ion concentration is higher in the extracellular fluid compared to the cytosol?
Which of the following best describes the resting membrane potential of a neuron?
Which of the following best describes the resting membrane potential of a neuron?
Which ion has a higher concentration inside the cytosol of a resting neuron compared to its extracellular fluid?
Which ion has a higher concentration inside the cytosol of a resting neuron compared to its extracellular fluid?
Which statement correctly describes the distribution of ions in a resting neuron?
Which statement correctly describes the distribution of ions in a resting neuron?
Flashcards
Neuron Excitability
Neuron Excitability
Neuron's ability to respond to a stimulus by creating an action potential.
Neuron Conductivity
Neuron Conductivity
Neuron's ability to transmit an action potential along its axon to other cells.
Plasma Membrane Polarization
Plasma Membrane Polarization
Electrical charge difference across a cell's plasma membrane due to unequal ion distribution.
Membrane Potential
Membrane Potential
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Resting Membrane Potential (RMP)
Resting Membrane Potential (RMP)
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Resting Membrane Potential
Resting Membrane Potential
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RMP Value
RMP Value
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ECF
ECF
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Cytosol
Cytosol
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Sodium (Na+) in ECF
Sodium (Na+) in ECF
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Potassium (K+) in Cytosol
Potassium (K+) in Cytosol
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Chloride (Cl-) in ECF
Chloride (Cl-) in ECF
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Membrane Polarization
Membrane Polarization
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Study Notes
Neuronal Physiology
- Neurons exhibit two key physiological properties: excitability and conductivity.
- Excitability means a neuron can respond to stimuli by generating an action potential.
- Conductivity refers to the neuron's ability to transmit an action potential along its axon to other cells.
Membrane Polarization
- Most cell membranes, including those of neurons, are polarized.
- Polarization arises from unequal ion distribution and differing protein compositions across the membrane.
- This difference in charge creates a voltage called the membrane potential.
- The resting membrane potential (RMP) is the membrane potential of an inactive cell.
- In a resting neuron, the RMP is -70mV.
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