Anatomy Practical 3

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When the calcium was removed from the extracellular solution

no neurotransmitter was released

When magnesium was added to the extracellular solution,

the amount of neurotransmitter released decreased

Calcium and magnesium are both

divalent cations

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

For the receptor potential

amplitude can vary with the stimulus intensity, requires the appropriate stimulus and can be graded with a stimulus intensity

What describes depolarization?

The membrane becomes less polarized

Why does the threshold increase when the internal between the stimuli decreases?

Some sodium channels have been inactivated and cannot be reopened immediately

During the relative refractory period,

another action potential can be generated provided the stimulus is large enough

When the interval between the stimuli decreases,

a second action potential is generated until the interval reaches the absolute refractory period

When the stimulus voltage is increased,

a greater-than-threshold depolarization results and sodium permeability into the cell increases to overcome the potassium exiting

Which fibers generate the smallest value for conduction velocity?

C fibers

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

In this activity, the stimulus voltage used was

the same for all of the axons and suprathreshold for all of the axons

What occurred in the presence of tetrodotoxin?

The number of action potentials decreased, and an action potential was always seen at R1

In the presence of lidocaine, the action potential was NOT affected at R1 because

lidocaine was applied downstream of R1

The effects of lidocaine and tetrodotoxin were

similar, but tetrodotoxin had a greater effect

The minimum voltage that is required to generate and action potential is called the

threshold voltage

Increasing the voltage resulted in

no change to the action potential

An axon that is more negative than the resting membrane potential is said to be


If an increase in extracellular potassium hyper polarizes a neuron,

it would change the membrane potential to a more negative value

Which of the following statements about receptor potentials is FALSE?

The receptor potential is carries by neuroglia

Which of the following is NOT a functional region of a neuron?

medullary region

The conducting region of the neuron is the


The typical concentration of sodium is

lower than potassium intracellularly

Which of the following describes a change from the resting membrane potential?

a receptor potential, a synaptic potential, or an action potential

The time interval between the action potential is called the

interspike interval

Increase in stimulus intensity

increases the frequency of action potentials

The frequency of action potentials is

the reciprocal of the interspike interval, and measured in Herz

During the relative refractory period

the stimulus must be above threshold to generate action potential

At a chemical synapse, the intensity of the stimulus is coded by

the amount of neurotransmitter released and the amount of calcium that enters the axon terminal

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