Nephrostome
Encyclopedia
Nephrostome is the funnel-like component of a metanephridium. It is always oriented towards the coelom
. The nephrostome is covered from the inside with cilia, which push the water
, metabolic waste
s, unnecessary hormones and other substances into the metanephridium.
Coelom
The coelom is a fluid-filled cavity formed within the mesoderm. Coeloms developed in triploblasts but were subsequently lost in several lineages. Loss of coelom is correlated with reduction in body size...
. The nephrostome is covered from the inside with cilia, which push the water
Water
Water is a chemical substance with the chemical formula H2O. A water molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state, ice, and gaseous state . Water also exists in a...
, metabolic waste
Metabolic waste
Metabolic wastes or excretes are substances left over from excretory processes, which cannot be used by the organism , and must therefore be excreted. This includes nitrogen compounds, water, CO2, phosphates, sulfates, insoles, medicals, food additives etc. Animals treat these compounds as excretes...
s, unnecessary hormones and other substances into the metanephridium.