Metamorphic grade refers to the temperature and pressure under which a rock was metamorphosed, considered low grade or high grade. Since metamorphic minerals in a rock form under specific conditions, they are used to identify the temperature and pressure of the metamorphic conditions.rotolith or parent rock is the rock type that a metamorphic rock was before it was subjected to metamorphic conditions.
Filtration occurs at the glomerulus, essential a highly coiled loop of tubular cells. Each kidney has millions of these cells. Arterial blood is pumped into the glomerulus. Water and ions are filtered via an osmotic gradient as well as other waste products.
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.