Reabsorbtion. Occuring more commonly within the nephron system than filtration, this is a form of active transport which takes the the useful substances for the body from the tubules and places them back into the blood filled capillaries.
Oleanders are shrubs, but they are _big_ shrubs. Most of the varieties in cultivation top out at 8 to 12 feet tall and about the same width. The wild form, and some of the older cultivars used for windbreaks top out at 20 x 20 feet.
I planted an Oleander hedge (about 20 plants) in my backyard near the house. I have had them for about 6 years and now they are about 4 feet tall and quite beautiful when they bloom. Lately, I have been getting bumps (like hives) all over my body and then they turn into small craters with scabs.