As stated above, if two solutions remain separated by a semipermeable membrane, water flows from the most dilute to the most concentrated solution. This diffusion of the solvent is called osmosis. When a plant cell is in a hypotonic environment, it absorbs water. Unlike the animal cell, it does not rupture because it is lined with the cell wall or cellulosic membrane, which is fully permeable but has limited elasticity, restricting the increase in cell volume.

The vast majority of animals have nerve and muscle cells. In all of them, the mechanism of operation of these cells is exactly the same. The internal coordination of the organism and its relationship with the environment are functions performed by the nervous system. The sensory system is responsible for receiving messages from the environment.

Is The sudden closure of the pulmonary artery or one of its branches, caused by air bubbles, tumor fragments, or often blood clots. The closure of a small artery may go unnoticed, but if a large artery is struck, the person experiences sudden chest pain, shortness of breath, increased sweating, palpitations, cyanosis, and eventually death.

Life depends on the realization of innumerable chemical reactions that take place inside and outside cells (for example, in organ cavities). On the other hand, all these reactions depend for their realization on the existence of a certain enzyme. Enzymes are protein group substances and act as catalysts for chemical reactions.

Also called coniferous forest or boreal forest. It is located in northern Alaska, Canada, southern Greenland, part of Norway, Sweden, Finland and Siberia. Departing from the Tundra, as you move south, the favorable season is longer and the climate milder. As a result, the vegetation is richer and the Taiga emerges.

Temperature range and thermal sensations In our daily lives, we are accustomed to having hot or cold sensations when we touch some objects. They are thermal sensations. We are used to associating these thermal sensations with the concept of temperature. We say, for example, that the temperature of an ice stone is lower than that of a roast beef that has just been removed from the oven.