Question

4. When did Theodor Schwann theorized
that all animals are composed of cells.
Cells that have distinct nucleus​

Answer 1

Respuesta:

Explicación:

In 1839, Schwann became acquainted with Matthias Schleiden's microscopic research on plants. Schleiden described the plant cell and proposed a cell theory that he was sure was the key to plant anatomy and growth. Following this line of research on animal tissues, Schwann not only verified the existence of cells, but also traced many of the stages of the early embryo in the development of adult tissues. This investigation and the cell theory that followed were summarized in Mikroskopische Untersuchungen über die Uebereinstimmung in der Struktur und der dem Thiere Wachstum und Pflanzen (1839; Microscopic investigations on the similarity in the structure and growth of fauna and flora). This work, in Schwann's own words, showed that "the great barrier between the animal kingdom and the vegetable kingdom, knowing the diversity of the definitive structure, disappears," he established the theory of the cell to the satisfaction of his contemporaries. Schwann then proposed three generalizations about the nature of cells such as;

animals and plants are made up of cells plus the secretions of cells;

these cells have an independent life;

they are subject to the life of the organism.

On the other hand, he realized that the phenomena of individual cells can be summarized in two classes: "those that refer to the combination of molecules to form a cell, called plastic phenomena", and "those that result from the chemical changes, either in the component particles of the cell itself, or in the cytoplastema (the current cytoplasm), called metabolic phenomena ». Thus Schwann coined the term "metabolism", [citation needed] which became generally adopted for the set of chemical processes and by which energy changes occur in living beings.

Answer 2

Respuesta:

Explicación:

The cytoplasm is the part of the protoplasm that, in eukaryotic cells, is located between the cell nucleus and the plasma membrane.1 2 It consists of a very fine colloidal emulsion with a granular appearance, the cytosol or hyaloplasm, and a variety of organelles cell phones that perform different functions.

Its function is to house the cellular organelles and contribute to their movement. The cytosol is the seat of many of the metabolic processes that take place in cells.

The cytoplasm is divided into a gelatinous outer region, close to the membrane, and involved in cell movement, which is called ectoplasm; and a more fluid internal part that receives the name of endoplasm and where most of the organelles are found.3

It is subdivided by a network of membranes (smooth endoplasmic reticulum and rough endoplasmic reticulum) that serve as a working surface for many of its biochemical activities. In it are several nutrients that managed to cross the plasma membrane, thus reaching the organelles of the cell.