Assuming the resting potential of a sensory neuron is -70mV, which of the following represents a
depolarization? - change to -60mV
What is the approximate concentration of K+ inside a typical cell? - 150mM
What is the approximate concentration of Na+ inside a cell? - 5mM
What is the approximate...
PhysioEx Exercise 3 quiz
Assuming the resting potential of a sensory neuron is -70mV, which of the following represents a
depolarization? - change to -60mV
What is the approximate concentration of K+ inside a typical cell? - 150mM
What is the approximate concentration of Na+ inside a cell? - 5mM
What is the approximate concentration of Na+ outside a cell? - 150mM
What is the approximate concentration of K+ outside a typical cell? - 5mM
A negative membrane potential was recorded when the tip of the microelectrode was - both
inside the cell body and inside the axon
Which of the following caused a change in membrane potential from -70 to -40 in the cell body? -
an increase in extracellular K+
Which of the following has the most negative voltage? - between the inside of the axon and the
outside of the axon with control K+ ECF
Which of the following is a sensory modality? - all of the above (touch, smell, sight, & paint)
which of the following is a sensory stimulus? - all of the above ( pressure, chemical odorants &
light)
Which of the following is true of the response of a sensory neuron to the appropriate sensory stimulus? -
it can be a receptor potential & it is a graded potential AND it is a change in the resting membrane
potential
, A very intense stimulus can sometimes stimulate sensory neurons that have evolved for a different
modality. Thus, with a blow to the eye, one "sees stars". In this example, the photoreceptors in the eye
are responding to - intense pressure
Olfactory receptor neurons respond to low concentrations of chemical odorants because there are
membrane proteins in the receptor ending of this sensory neuron that - can bind and respond to
the specific odorant
The sequence of events starting with a sensory stimulus and ending with a change in membrane
potential is called - sensory transduction
Starting at a resting membrane potential of -70mV a change to which of the following represents the
largest receptor potential? - a change to -50mV
Axons are - long, thin structure that extend from a neuronal cell body
which of the following is easier? - extracellular recordings of action potential
An action potential is usually initiated in an axon at or near - all of the above (the axon hillock, the
initial segment, or the trigger zone)
The initiation of an action potential in a sensory neuron in the body normally - follows a
sufficiently large depolarizing receptor potential
The threshold voltage in an axon is usually - less negative than the resting membrane potential
If a graded receptor potential made the resting potential of the axon more negative (for example, -70mV
changes to -75mV) you would expect - it to be more difficult for this axon to reach the threshold
voltage
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