The Amplitude of the Local Graded Potential Is Decreasing as the Potential

Multiple Choice

The amplitude of the local graded potential is decreasing as the potential is spreading over the neuronal membrane because of the

A) phospholipid bilayer.
B) presence of myelin sheaths.
C) presence of ion pumps in the plasma membrane.
D) presence of ion channels in the plasma membrane.
E) net negative charge inside the cell.