Membrane potential
Why does the sodium–potassium pump help maintain a neuron's resting membrane potential?
The pump uses ATP to move three sodium ions out and two potassium ions in, maintaining the ion gradients that support the resting potential.
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Working memory
Why is working memory different from long-term memory?
Working memory temporarily holds and manipulates a limited amount of information, while long-term memory stores information for much longer periods and has a much larger capacity.
Molar concentration
What happens to a solution's molar concentration when its volume doubles but the amount of solute stays the same?
The concentration is halved, because molarity is the amount of solute divided by the volume of solution.
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