Brooklyn College explains that cells are small because they must have a large surface area relative to the amount of volume they contain to function properly. As a sphere grows larger, its volume increases much more rapidly than its surface area does. This presents logistical problems for the cell, as it tries to transport resources and products through a large volume without the resources available via a large surface.Know More
As an example, a typical animal cell requires oxygen to survive. The size of the cell partially dictates the amount of oxygen it needs, while the surface area of the cell limits the amount of oxygen that can be absorbed at a time. Accordingly, when the size of a cell grows, its demand for oxygen and other resources rises at a rapid rate, while its capacity for absorbing oxygen increases more slowly. At some point, the size of the cell will cause the cell to divide or die, according to Brooklyn College.
Despite the limitations on cell size that are imposed by the surface-to-volume ratio, a 2013 study published in the journal Nature Cell Biology demonstrates that gravity also limits cell size. While gravity is a negligible force at very small scales, cells that attain about 1 millimeter in diameter must include structural elements to keep some organelles stable under the influence of gravity. Without such elements, cell components can lose their structural integrity.Learn more about Cells
The cheek cells, also called epithelium cells, are responsible for maintaining moisture in the oral cavity which in turn aids in digestion, softening food for consumption and facilitating swallowing. Cheek cells constantly produce a flow of muicin, which is the main part of mucous. The cheeks cells divide every 24 hours and are shed rapidly from the body.Full Answer >
Meristematic cells are plant cells that divide and create new cells. They are physically responsible for the growth of the plant. There are two main types of meristematic cells: primary or apical meristems, which are responsible for increases in length, and secondary or lateral meristems, which cause an increase in width.Full Answer >
A root hair cell has a large surface area that is ideal for absorbing nutrients, and its sap has a higher salt concentration than the surrounding soil water. It has a semipermeable membrane that permits minerals and water molecules to enter but not to leave. Since it is responsible for providing nutrition and water to the plant, it possesses a tough wall that allows it to go deep underground.Full Answer >
Orange County Community College explains that cyclins are one of many proteins within a eukaryotic cell that regulate the cellular life cycle. All cyclins belong to the same genetic family, which contains several different subtypes.Full Answer >