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.
Filtration is driven by the hydrostatic pressure of the blood, and causeswater and small molecules to be filtered, while blood cells and large molecules like proteins do not pass through the filter. Source [10]. In reabsorption & secretion, as the filtrate passes down the nephron most of it is reabsorbed into the blood.he distinctive feature is that the tubule makes a sharp bend at the loop of Henle which allows tubule fluid to move downward into regions of increasing osmotic pressure (see diagram below). After the bend the tubule fluid moves upward through regions of decreasing osmotic pressure.