••• bio a nerve cell in its resting state has a membrane potential of −70 mv, meaning that the potential inside the cell is 70 mv less than the potential outside due to a layer of negative charge on the inner surface of the cell wall and a layer of positive charge on the outer surface. this effectively makes the cell wall a charged capacitor. when the nerve cell fires, sodium ions, na , flood through the cell wall to briefly switch the membrane potential to +40 mv. model the central body of a nerve cell—the soma—as a 50-μm-diameter sphere with a 7.0-nm-thick cell wall whose dielectric constant is 9.0. because a cell’s diameter is much larger than the wall thickness, it is reasonable to ignore the curvature of the cell and think of it as a parallel-plate capacitor. how many sodium ions enter the cell as it fires?
the answer is z.
the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.