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PHY2011 - Neuroscience of communication, sensory and control systems - S1 2025

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At the end of the absolute refractory period after an action potential

All voltage-gated Na⁺ channels open.

Enough voltage-gated Na⁺ channels open to allow a second AP at the same threshold.

Only half the number of voltage-gated Na⁺ channels in the membrane open.

Voltage-gated Na⁺ channels begin to recover in a random stochastic process.

Enough voltage-gated Na⁺ channels open to allow a second AP at a threshold about 50% lower than prior to the first AP.

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What is the osmolarity, in mOsm, of a 598 mM NaCl solution?

Do not enter units in your answer.

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What is the molarity, in M, of a 0.61% w/v MgSO₄.7H₂O solution.