What is the process called when embalming fluid passes through capillary walls?

The process of embalming fluid passing through capillary walls is known as pressure filtration. During embalming, fluid is introduced under pressure, which forces the embalming fluid through the capillary walls into the surrounding tissues. This method is quite effective in ensuring that the fluid permeates adequately to preserve the tissues, as it utilizes the differential pressure to facilitate the movement of fluid from a region of higher pressure (inside the capillaries) to regions of lower pressure (the surrounding interstitial spaces).

While the other processes like diffusion and osmosis involve movement of substances, they do not effectively encompass the use of external pressure to facilitate fluid transfer through membrane barriers, as is the case in embalming. Absorption refers to the process of a substance being taken up into another entity (like a sponge soaking up water) but doesn't capture the specific mechanics involved in how embalming fluids are forced into tissues. In this context, pressure filtration accurately describes the unique physiological context in which embalming occurs.