This means that the size of the cell is limited, and an increase in size is associated with the formation of multicellular organisms. The formation of multicellular organisms. It follows that with an increase in size: the cell will begin to starve, the surface will not provide nutrients to the entire volume, especially by diffusion gas exchange is difficult the excretion of waste products is difficult heat transfer is difficult. Let's double the size and compare the ratios of surface areas and volumes of large and small cells.įormation of multicellular organisms Cube area: 1 x 1 x 6 = 6 cm2 Volume: 13 = 1 cm3 Ratio = 6: 1 increased by 4 times, and the volume - by 8 times, which means that for each unit of surface there will now be already two units of volume. Let's assume that the cell-cube has a face length of 1 cm. The easiest way is to increase the size of the cell, but this way turns out to be a dead end - the size of the cells is limited by the ratio of surface and volume. The formation of multicellular organismsSingle-celled organisms are microscopically small, and this imposes restrictions on the possibility of complication and the appearance of various organs for more efficient development of the environment. 1 of 18 Presentation on the topic: Type Lamellar, Sponge type
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |