Symptoms of the prolapsed uterus can include feeling like something is coming out even though you aren't having a baby, lower back pain, trouble using the bathroom and painful intercourse. Lower back pain has lots of causes, but I've never heard of this particular one.
Facilitated diffusion is a passive process: The solutes move down the concentration gradient and don't use extra cellular energy to move. Channel proteins are another type of facilitated diffusion that allow the selective transport of one type of hydrophilic molecule across the cell membrane.
Note: These types of facilitated diffusion are diffusion because they involve particles moving down their concentration gradients and facilitated because the movement is assisted by the role of the proteins. 3. Osmosis. Osmosis is the diffusion of water across membranes.