The Latin name is from the Japanese name for T. sieboldii. T. canadensis and T. heterophylla were discovered early (before 1800) and until 1855 were simply treated as species of Pinus, but in 1842 T. sieboldii, the southern Japanese hemlock, was described as Abies tsugae.
The brains of the cell, the nucleus directs cell activities and contains genetic material called chromosomes made of DNA.
The cell is filled with fluid in which the organelles and cellular structures are located. The fluid is called cytoplasm. It contains some digestive enzymes that are responsible for regulating the environment of the cell. However, the bulk of digestive enzymes are sequestered into specialized organelles so that they do not damage the cell. Lysosomes Lysosomes, which are organelles that are surrounded by their own membrane, have an acidic interior.