18 Questions
What unusual activity constitutes the propagation of an electrical signal?
Depolarization
During depolarization, what type of ions flow into the cell?
Na+ ions
What event characterizes repolarization during an action potential?
A decrease in voltage due to K+ ions efflux
What is the membrane resting potential typically around?
-70 mV
Which process is responsible for hyperpolarization?
Efflux of K+ ions
What causes depolarization during an action potential?
Influx of Na+ ions
What are graded potentials?
Minor perturbations in the membrane potential due to neurotransmitter binding
How are action potentials different from graded potentials?
They initially have large depolarizations above the resting value
What is the threshold for an action potential?
-55 mV
What is the resting membrane potential?
-70 mV
During an action potential, what occurs after depolarization?
Repolarization happens
What leads to graded potentials adding up and propagating short distances along the membrane?
Binding of neurotransmitters
What is the average Resting Membrane Potential (RMP) of a typical neuron?
-70 mV
Which ion has a higher concentration inside the cell compared to outside?
K+
What is the voltage difference when the extracellular potential is defined as 0 V?
-70 mV
What happens during depolarization of a cell membrane?
The membrane potential becomes more positive.
What is the main factor contributing to the Resting Membrane Potential (RMP)?
Unequal distribution of ions
Which cell type exhibits a Resting Membrane Potential closest to -95 mV?
Skeletal muscle fibers
Test your knowledge on the threshold potential where the cell membrane opens up for Na+ transport, leading to action potential propagation in Molecular Biophysics 2024. This quiz covers the membrane resting potential, depolarization, and the unusual activity related to electrical signal propagation.
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