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Lab Physio Ex exercise 3

Terms in this set (29)

The receptor potential is generated at the _______.
receiving region
Sensory transduction is defined as _______.
the conversion of a stimulus to a change in membrane potential
The receptor potential _______.
amplitude can vary with the stimulus intensity, requires the appropriate stimulus and can be graded with a stimulus intensity
Which of the following describes a depolarization?
The membrane becomes less polarized
Which of the following occurs first in the generation of an action potential?
The membrane depolarizes
Which of the following occurs during depolarization?
sodium flows into the cell
Which of the following occurs during repolarization?
Voltage-gated potassium channels open and some voltage-gated sodium channels inactivate. Potassium flows out of the cell.
Which of the following allow the movement of potassium through the neuronal membrane?
leakage channels and voltage-gated potassium channels
In this activity, the stimulus voltage used was
the same for all of the axons and suprathreshold for all of the axons
The time interval for conduction would be shortest with,
the largest and most heavily myelinated axons
Increasing the amount of myelination
decreases the time between action potentials
Which fibers generate the smallest value for conduction velocity?
C fibers
What effect did increasing the extracellular potassium have on the resting membrane potential?
The resting membrane potential became less negative.
What effect did decreasing the extracellular sodium have on the resting membrane potential?
Only a small change occurred, because the resting neuron is not very permeable to sodium.
The channels that provide for the movement of potassium in the resting neuron are _______.
leakage
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