The gel-like material within the cell membrane is referred to as the cytoplasm. It is a fluid matrix, the cytosol, which consists of 80% to 90% water, salts, organic molecules and many enzymes that catalyze reactions, along with dissolved substances such as proteins and nutrients.
The River Thames is the second longest river in the United Kingdom and the longest river entirely in England, rising at Thames Head in Gloucestershire, and flowing into the North Sea at the Thames Estuary.
It rises at Thames Head in Gloucestershire, and flows into the North Sea at the Thames Estuary via London, the country's capital, where it is particularly deep and navigable; the Thames drains the whole of Greater London.