If the cell membrane becomes totally impermeable, water and dissolved gases, most notably oxygen, would no longer be able to enter or leave the cell. The cell membrane is usually permeable to a number of substances, mostly small, nonpolar molecules. Other polar or charged particles are transported across the membrane by special embedded protein structures, and so would not be directly affected by a change in membrane permeability.Know More
The membrane permeability of animal cells and many other organisms is crucial to their survival. The inability to absorb oxygen or release carbon dioxide would quickly be lethal to such organisms. However, other organisms less dependent on oxygen-based metabolism would survive a while longer, although the condition would eventually kill them as well. One example is yeast, which takes in food molecules and generates energy from them without the need for oxygen.
The ability for water to pass through cell membranes is often as much a hindrance to the cell as it is a benefit. Many cells, particularly single-celled organisms, exist in environments with a different amount of solute in the water outside than they have inside. Thus, water tends to move into or out of the cell constantly, which the cell compensates for by expending energy.Learn more about Cells
The cell membrane is a flexible membrane that surrounds all eukaryotic cells. The membrane holds all of the organelles inside of the cell and keeps certain solutes from coming into or leaving the cell.Full Answer >
Unlike the cell membrane, the cell wall is not common to all types of cells. A protective layer that surrounds the cell membrane, one of its main functions is to prevent over-expansion of a cell.Full Answer >
The cell membrane is said to be selectively permeable because it lets certain substances pass through while restricting the passage of others. The actual structure of the cell membrane allows free passage or restricts movement of substances across the membrane. Three ways in which the cell membrane controls the movement of substances is simple diffusion, facilitated diffusion and active transport.Full Answer >
The cell membrane is a lot like a wall or fence surrounding a city that keeps everything that is dangerous or harmful out, but lets in and out certain materials that are vital for the cell to survive. The chemicals on the cell membrane recognize which materials should be able to push through it, much like a gate in a fence or wall.Full Answer >