A Scientist Wants to Study the Effects of Summation on Graded

question 90

Multiple Choice

A scientist wants to study the effects of summation on graded potentials. Her assistant applies the stimuli, but there is no apparent result. Compose a situation that would explain these results.

• A) The stimuli were given, but they did not reach threshold.
• B) The stimuli were given too soon after a trial run and the membrane was still in a refractory period.
• C) The stimuli caused a hyperpolarization, but graded potentials are only depolarizing.
• D) Two stimuli, equal in amplitude, but opposite in polarity were given and when summed they cancelled each other out.

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