The fluid part of blood flows in and out of capillaries in tissues to exchange nutrients and waste
materials. Under which of the following conditions will fluid flow out from the capillaries into the
surrounding tissue?
(1) When arterial blood pressure exceeds blood osmotic pressure
(2) When arterial blood pressure is less than blood osmotic pressure
(3) When arterial blood pressure is equal to blood osmotic pressure
(4) Arterial blood pressure and blood osmotic pressure have nothing to do with the outflow of fluid from capillaries
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☆answer your option with explanation!
Thanks.
Answers
Answer:
(1) When arterial blood pressure exceeds blood osmotic pressure.
Explanation:
The primary force driving fluid transport between the capillaries and tissues is hydrostatic pressure. A pressure generated by fluid on the walls of the capillary, usually forcing water out of the circulatory system is called the Hydrostatic Pressure.
You see, blood osmotic pressure, basically, is the minimum pressure which needs to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane and arterial blood pressure is the pressure of circulating blood against the walls of blood vessels.
So, for the fluid to move outside the capillaries the pressure inside them must be greater than the Blood Osmotic Pressure or simply the quantity "ABP - BOP" must be positive. So, for it to be positive ABP must be greater than BOP and hence, Option-(1) is the correct answer.