Table of Contents
Which of the passive transport processes requires hydrostatic pressure to transport molecules across membranes in the body?
Filtration is movement of water and solute molecules across the cell membrane due to hydrostatic pressure generated by the cardiovascular system. Depending on the size of the membrane pores, only solutes of a certain size may pass through it.
What is passive transport filtration?
Filtration is another passive process of moving material through a cell membrane. While diffusion and osmosis rely on concentration gradients, filtration uses a pressure gradient. Molecules will move from an area of higher pressure to an area of lower pressure. Filtration is non-specific.
How does hydrostatic pressure affect the flow of fluid in the capillary?
Hydrostatic pressure is the force generated by the pressure of fluid within or outside of capillary on the capillary wall. The net filtration pressure derived from the sum of the four forces described above determines the fluid flow into or out of the capillary.
How does fluid move through the capillary membrane?
Four Primary Hydrostatic and Colloid Osmotic Forces Determine Fluid Movement Through the Capillary Membrane. Figure16–5 shows the four primary forces that determine whether fluid will move out of the blood into the inter-stitial fluid or in the opposite direction.
Hydrostatic pressure is a force generated by the pressure of fluid on the capillary walls either by the blood plasma or interstitial fluid. The net filtration pressure is the balance of the four Starling forces and determines the net flow of fluid across the capillary membrane.
How is osmotic pressure different from hydrostatic pressure?
Osmotic Pressure. The net pressure that drives reabsorption—the movement of fluid from the interstitial fluid back into the capillaries—is called osmotic pressure (sometimes referred to as oncotic pressure). Whereas hydrostatic pressure forces fluid out of the capillary, osmotic pressure draws fluid back in.