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Based on what you have learned about how cells ensure that proteins end up in the right place (Chapter 7), what type of signal would you expect to be exposed on a cytosolic receptor after a steroid hormone changes the receptor's conformation?
Amino acids required for transport through the nuclear pore complex
Initiating an action potential
Under most circumstances, once an axon's membrane potential reaches threshold (about -55 mV in mammals), an action potential is automatically triggered. The graph below shows the changes in membrane potential that occur in an axon membrane that is initially at resting potential.
In response to a stimulus, the membrane slowly depolarizes until the membrane potential reaches a particular value, called threshold. At threshold, a rapid depolarization of the membrane occurs and an action potential is initiated.
Drag the labels onto the flowchart to show the sequence of events that occurs once
the membrane potential
-1. membrane potential reaches threshold
-2. Na+ ions rush into the cell
-3. membrane potential rises (depolarizes) rapidly
-4. many Na+ voltage-gated channels open
The ANSWER WILL SURELY BE
membrane potential reaches threshold ---> many Na+ voltage-gated channels open ---> Na+ ions rush into the cell ---> membrane potential rises (depolarizes) rapidly
(1--->4--->2--->3)
