In laminar flow, if diameter is reduced to half ?: (A) Blood flow increases four fold, (B) Blood flow decreases four fold, (C) Blood flow increases sixteen-fold, (D) Blood flow decreases sixteen-fold
Answer is D. Ans. is 'd' i.e., Blood flow decreases sixteen-foldIf everything else remains constant, blood flow is direactly poropoional to 4th power of radius.Thus, if the diameter (or radius) is reduced to half, blood flow will decrease sixteen-fold.