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BIO NMDCAT Biological Importance of Water
nmdcat.online June 27, 2026

The primary reason that the symptom of “brain fog” is associated with severe dehydration is the

A. Reduction in the specific heat of the cerebrospinal fluid
B. Direct denaturation of neuronal enzymes by water loss
C. Disruption of the ionic and osmotic balance critical for neuronal action potentials and synaptic transmission
✓
D. Over-hydration of the synaptic cleft, diluting neurotransmitters

📝 Explanation

Dehydration alters the precise ionic concentrations of Na⁺, K⁺, and Ca²⁺ outside and inside neurons. This disrupts the membrane potential, action potential generation, and neurotransmitter release, leading to impaired cognitive function. The brain is highly sensitive to osmotic shifts.

📖 Additional Information

  • Reduction in the specific heat of the cerebrospinal fluid
  • Direct denaturation of neuronal enzymes by water loss
  • Disruption of the ionic and osmotic balance critical for neuronal action potentials and synaptic transmission
  • Over-hydration of the synaptic cleft, diluting neurotransmitters

Dehydration alters the precise ionic concentrations of Na⁺, K⁺, and Ca²⁺ outside and inside neurons. This disrupts the membrane potential, action potential generation, and neurotransmitter release, leading to impaired cognitive function. The brain is highly sensitive to osmotic shifts.

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