NSEB topic read · 3 min
Read Capillary Exchange as a Pressure Balance
Use net filtration pressure as the hydrostatic difference minus the opposing osmotic difference.
NSEB · Body Fluids and Circulation · 1 linked question · 100% coverage
Know this first
Motion and force questions become simpler when direction, starting condition, time and the acting forces are marked first.
Distance · Length of the path travelledDisplacement · Straight-line change in positionResultant force · Net force including direction
Study deeper: NCERT Biology · Body Fluids and Circulation
Solve each capillary end separately
At the arterial end, 11 mm Hg net outward with a 25 mm Hg osmotic pull needs 36 mm Hg hydrostatic pressure. At the venous end, 10 mm Hg net inward needs 15 mm Hg hydrostatic pressure. Choose D.
OlympIQ exam lens
- ✓Net outward pressure = hydrostatic − osmotic.
- ✓At the venous end, oncotic pull can exceed hydrostatic push.
OlympIQ trap
Keep outward and inward signs separate; do not subtract the same way at both ends.
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