Question

Choose from the following ions to fill in the blanks correctly: Na+,K+,Ca2+,Cl−

a The resting cell membrane is more permeable to than to . Although contribute little to the resting membrane potential, they play a key role in generating electrical signals in excitable tissues.

b The concentration of is 12 times greater outside the cell than inside.

c The concentration of is 30 times greater inside the cell than outside.

d An action potential occurs when enter the cell.

e The resting membrane potential is due to the high permeability of the cell.

Answer 1

The resting cell membrane is more permeable to Potassium (K+) than to Sodium (Na+). Calcium (Ca2+) contributes little to the resting membrane potential but plays a key role in generating electrical signals. The concentration of Sodium (Na+) is 12 times greater outside the cell, while the concentration of Potassium (K+) is 30 times greater inside the cell.

Step-by-step explanation:

The resting cell membrane is more permeable to Potassium (K+) than to Sodium (Na+).

Although Calcium (Ca2+) contribute little to the resting membrane potential, they play a key role in generating electrical signals in excitable tissues.

The concentration of Sodium (Na+) is 12 times greater outside the cell than inside.

The concentration of Potassium (K+) is 30 times greater inside the cell than outside.

An action potential occurs when Sodium (Na+) enters the cell.

The resting membrane potential is due to the high permeability of the cell to Potassium (K+).