Question

Which of these would you expect if someone drank a dangerously large volume of H2O?

1) blood has same  same osmotic pressure as ECF

2) blood osmolarity is high and water enters the tissue space

2) low blood osmolarity/water enters the tissue space

3) Blood has a higher osmotic pressure than ECF

Answer 1

low blood osmolarity/water enters the tissue space

• In human , kidney control the amount of water, salts and other solutes leaving the body by sieving blood through their millions of twisted tubules.
• Dilution of blood occurs, or some type of hyponatremia occurs.Hence insufficient salt occurs in blood occurs lead to nausea , fatigue , head ache etc.
• When a person drink a large amount of water in short amount of time , kidney cannot flush it out fast enough and blood becomes waterlogged.This excess water leaves the blood ,ultimately enter the cell , which swell like balloons to accommodate it.
• Osmolarity is the measure of solute concentration .
• When excess water enter into body , osmolarity decreases hence 2nd option  is wrong.
• Osmotic pressure increased when large amount of solutes present, hence option 1st and last option is wrong.