Resting Membrane Potential LO4 Flashcards

Cells tissue and skin

1
Q

Resting Membrane Potential

A

Potential energy (called voltage and measured in volts) that
exists across the plasma membrane resulting from
separating opposite charges by the plasma membrane
5 neg, 5 pos on inside and outside
ECF is slightly more positive than ICF

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2
Q

Ion concentrations and leakage channels

A
  • ECF: higher concentration of Na+
  • Na+ moves into cell through Na+ leakage channel
    ICF: higher concentration of K+
  • K+ moves out of cell through K+ leakage channels
  • plasma membrane contains more K+
    leakage channels than Na+
    so more K+ ions move out of the cell than Na+ moves in.
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3
Q

Resting Membrane Potential generated by

A

the movement of potassium K+ ions from ICF
to ECF through K+
leakage channels in plasma membrane leaving
the outside of plasma membrane positive relative to the inside

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4
Q

Resting membrane potential maintained by

A

the active transport of ions using the carrier protein called the Na+/K+ ATPase pump
to stop the ions reaching equilibrium
the Na+ /K+ ATPase pump:
➢pumps out 3 Na+ ions
➢pumps in 2 K+ ions

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