Getty/Jason Hosking. A niche is a term that is used in ecological biology to define an organism's role in an ecosystem. Not only does a niche include the environment a given organism lives in, it also includes the organism's job in that environment.
Perilymph (also known as Cotunnius' liquid, and liquor cotunnii) is an extracellular fluid located within the cochlea (part of the inner ear) in two of its three compartments: the scala tympani and scala vestibuli. The ionic composition of perilymph is comparable to that of plasma and cerebrospinal fluid. The major cation (positively charged ion) in perilymph is sodium: The values of sodium and potassium concentration in the perilymph are 138 mM and 6.9 mM, respectively.
(cardiac output is the amount of blood pumped out of the ventricle each minute). a regular bottle of water contains about 590 ml. 1  1000 to 1200ml of blood go through each glumeruli of each nephron every minute. 2  Equals 650 ml of plasma (blood cells cannot be filtered). 3  1/5 of this goes through the renal tubules. 4  The entire plasma volume is filtered 60X a day or 180 liters of water per day.