Unit 2

Front

What is the membrane potential?

Back

the charge difference between the inside and outside of a cell

Front

In a resting neuron (a neuron at the resting membrane potential), where is the concentration of sodium ions higher?

Back

outside the neuron (extracellular)

Front

What is the term for a membrane potential change that is relatively more negative than the resting potential?

Back

hyperpolarized

Front

What is the term for a membrane potential change that is relatively more positive than the resting potential?

Back

depolarized

Front

What term describes when subthreshold stimuli are added together to reach threshold and generate an action potential?

Back

summation

Front

Threshold for generation of an action potential is defined at which value?

Back

-55mV

Front

Repolarization during an action potential is due to

Back

voltage-sensitive K⁺ channels opening and K⁺ moving out of the cell

Front

Depolarization during an action potential is the result of

Back

voltage-sensitive Na⁺ channels opening and Na⁺ moving into the cell

Front

What is the correct order of events associated with an action potential?

Back

stimulus, reaching threshold, depolarization, repolarization, hyperpolarization

Front

Which of the following combinations would provided the fastest impulse conduction?

Back

a thick axon and myelin