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 cell membrane regulates what enters and exits the cell. Let's look at the cell membrane and see how itsâ structure allows it to perform this important task. When you think about a membrane, imagine it is like a big plastic bag with some tiny holes. That bag holds all of the cell pieces and fluids inside the cell and keeps any nasty things outside the cell.