Quiz on Membrane Potential

What is the primary composition of cell membranes?

• Proteins and carbohydrates

• Nucleic acids and lipids

• Lipid and proteins

• Carbohydrates and nucleic acids

Which ion has a higher concentration outside the cell?

• Na+

• Cl-

• K+

• Ca2+

What is the resting membrane potential (RMP) of a neuron approximately?

• -50mV

• -70mV

• -90mV

• -30mV

What does the Nernst equation calculate?

• Membrane permeability

• Concentration gradient

• Equilibrium potential

• Resting membrane potential

What is the role of Na+,K+-ATPase?

• Transport glucose into the cell

• Generate action potentials

• Establish concentration gradients for Na+ and K+

• Facilitate water movement

What is the driving force for ion movements across the membrane?

• Temperature gradient

• Concentration gradient

• Volume gradient

• Pressure gradient

Which ion tends to move into the cell due to its concentration gradient?

• Ca2+

• K+

• Cl-

• Na+

What is the main factor that establishes the ionic composition of cells?

• Passive diffusion

• Active transport

• Osmosis

• Facilitated diffusion

What happens to the membrane potential when K+ ions leak out of the cell?

• It fluctuates randomly

• It remains unchanged

• It becomes more negative

• It becomes more positive

What is the equilibrium potential?

• The moment when ion movement is balanced

• The voltage difference across a cell membrane

• The concentration of ions inside the cell

• The resting state of a neuron