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

In a human consuming a very salty meal, the resulting increase in blood plasma osmolarity directly leads to

A. A shift of water from the intracellular fluid to the extracellular fluid
✓
B. An increase in the hydrostatic pressure inside the capillaries
C. Water intoxication and swelling of the brain cells
D. Immediate secretion of a large volume of dilute urine

📝 Explanation

An increase in plasma solute (NaCl) concentration decreases its water potential. Water moves by osmosis from the area of higher water potential (inside cells) to the area of lower water potential (blood plasma), leading to cellular dehydration and increased blood volume/pressure.

📖 Additional Information

  • A shift of water from the intracellular fluid to the extracellular fluid
  • An increase in the hydrostatic pressure inside the capillaries
  • Water intoxication and swelling of the brain cells
  • Immediate secretion of a large volume of dilute urine

An increase in plasma solute (NaCl) concentration decreases its water potential. Water moves by osmosis from the area of higher water potential (inside cells) to the area of lower water potential (blood plasma), leading to cellular dehydration and increased blood volume/pressure.

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