Which of the following statements about GRADED POTENTIALS are true? (Four answer

Question

Which of the following statements about GRADED POTENTIALS are true? (Four answers)

Which of the following statements about GRADED POTENTIALS are true? (Four answers) The end-plate potential (EPP) is a graded potential. The relative refractory period of an action potential is a graded potential. EPSPs (excitatory post synaptic potentials) are graded potentials. A transmitter that opens K+ channels can produce an inhibitory graded potential. Graded potentials are all-or-none. A transmitter that opens channels permeable to both Na+ and K+ can produce an excitatory graded potential. The after-hyperpolarization phase of the action potential is a graded potential. The amplitude of a graded potential is the same at the stimulus site as it is at some distance from the stimulus site.

Explanation / Answer

SOLUTION:

1 – False

End plate potential is a synaptic potential but graded potential is post synaptic potential

2 –False

No refractory period is associated with graded potential.

3-True

EPSPs (excitatory post synaptic potentials) are graded potentials.

Graded potentials that make the membrane potential less negative or more positive, thus making the postsynaptic cell more likely to have an action potential, are called excitatory postsynaptic potentials (EPSPs).

4-True

A transmitter that opens K+ channels can produce an inhibitory graded potential.

Graded potentials that make the membrane potential more negative, and make the postsynaptic cell less likely to have an action potential, are called inhibitory post synaptic potentials (IPSPs).

5-False

Graded potentials are all or none.

Graded potentials are changes in membrane potential that vary in size, as opposed to being all-or-none.

6-True

A transmitter that opens channels permeable to both Na+ and K+ can produce an excitatory graded potential.

7-True

The amplitude of a graded potential is the same at the stimulus site as it is at some distance from the stimulus site as it is a some distance from the stimulus site.  

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