1a. Describe how the permeability of the axon membrane to Na 1 and K 1 is...

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Medical Sciences

1a. Describe how the permeability of the axon membrane to Na 1and K 1 is regulated and how changes in permeability to these ionsaffect the membrane potential.
1b. Describe how gating of Na 1 and K 1 in the axon membraneresults in the production of an action potential.
1c. Explain the all-or-none law of action potentials, anddescribe the effect of increased stimulus strength on actionpotential production. How do the refractory periods affect thefrequency of action potential production?
1d. Describe how action potentials are conducted by unmyelinatednerve fibers. Why is saltatory conduction in myelinated fibers morerapid?
1e. Describe the location of neurotransmitters within an axonand explain the relationship between presynaptic axon activity andthe amount of neurotransmitters released.
1f. Describe the sequence of events by which action potentialsstimulate the release of neurotransmitters from presynapticaxons.

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3.5 Ratings (341 Votes)

1 a Depolarization makes the cell less polar membrane potential gets smaller as ions quickly begin to equalize the concentration gradients Voltagegated sodium channels at the part of the axon closest to the cell body activate thanks to the recently depolarized cell body This lets positively charged sodium ions flow into the negatively charged axon and depolarize the surrounding axon We can think of the channels opening like dominoes falling down once one channel opens and lets positive ions in it sets the stage for the channels down the axon to do the same thing Though this stage is known as depolarization the neuron actually swings past equilibrium and becomes positively See Answer

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