alleryStart learning →Filtration is described as a variation of diffusion. What distinguishes it?
AMovement runs against the concentration gradient
BCarrier proteins bind each molecule in turn
CThe rate is enhanced by applied pressure
DATP hydrolysis supplies the driving force
Answer & Solution
Correct answer: C. The rate is enhanced by applied pressure
1. In filtration, material still moves according to its concentration gradient through a membrane.
2. What is added is pressure, which enhances the rate and causes substances to filter more rapidly.
3. This occurs in the kidney, where blood pressure forces water and dissolved solutes out of the blood into the renal tubules.
4. Since movement still follows the gradient and needs no ATP, filtration remains a passive process.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 5 "Structure and Function of Plasma Membranes", section 5.2 Passive Transport_
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