AP BIOLOGY

Detailed explanation-1: -Eventually Schwann found the enzyme pepsin, which he successfully isolated from the stomach lining and named in 1836. Schwann coined its name from the Greek word pepsis, meaning “digestion” (from peptein “to digest"). Pepsin was the first enzyme to be isolated from animal tissue.

Detailed explanation-2: -Schwann concluded three things that became vital components of the cell theory. First, Schwann concluded that both plants and animals were composed of cells. Second, these cells have independent lives. Third, these independent lives are subject to the organism’s life.

Detailed explanation-3: -In 1838, Schwann was appointed to the chair of Anatomy at the Université Catholique de Louvain in Belgium where he served for 9 years and during this period wrote a paper describing the physiological role of bile in digestion based on his experiments in dogs.

Detailed explanation-4: -In 1838, Schwann and Matthias Jakob Schleiden (1804-1881) developed the “cell theory.” Schwann went on and published his monograph Microscopic Researches into Accordance in the Structure and Growth of Animals and Plants in 1839.

Detailed explanation-5: -Theodor Schwann, (born December 7, 1810, Neuss, Prussia [Germany]-died January 11, 1882, Cologne, Germany), German physiologist who founded modern histology by defining the cell as the basic unit of animal structure.