We now class tellurium as a metalloid because, as the confused scientists of the 1700s first noticed, it has properties that sit between those of metals and nonmetals. Hubble Telescope Wide Field Camera 3.
Water also easily enters the lymphatic capillaries via gaps between the lymphatic endothelial cells. These gaps function also as flap valves and this also promotes forward lymph flow when the capillaries are compressed. In other areas of the body the water permeability of capillary membranes is quite low.
The inside isn't too important to this question, so I'll focus on the outside. Each plant cell has what is called a cell wall - this is pretty much just what it sounds like, a firm 'wall' around the cell. This wall, however, isn't completely solid - certain things, like water, can get through it. For a picture of a plant cell, look The cell wall is in blue around the outside. Plant cells are pretty much designed to absorb water. If you want to do an experiment with this, take a limp piece of celery and put it in some cold water. You will notice that after a little while, the celery firms back up.