Fill in the Blank QuestionFill in the blank question.Movement of molecules across the capillary wall due to differences in hydrostatic pressure is called .

The movement of molecules across the capillary wall due to differences in hydrostatic pressure is called filtration.

Explanation

Filtration is a passive transport mechanism facilitated by hydrostatic pressure gradients that exist in the blood vessels. In capillaries, the blood pressure is often higher than the pressure in the surrounding interstitial fluid. This pressure difference forces water and solutes, such as ions, glucose, and small molecules, through the capillary wall into the interstitial space. This process is crucial for various physiological functions, including the delivery of nutrients to tissues and the removal of waste products. It is important to note that filtration primarily applies to the movement of substances across capillary walls and differentiates from other transport mechanisms like diffusion and osmosis that rely on concentration gradients.