Answer:
In explanation.
Explanation:
-The plasma membrane also maintains homeostasis by making sure materials can move in or out as necessary. Homeostasis depends on maintaining correct fluid levels within the cell and on exchanging useable materials, such as oxygen, for waste products, such as carbon dioxide.
-Plasma membranes allow water, oxygen, and carbon dioxide to pass through by osmosis or passive diffusion. Passive diffusion is the process in which molecules travel through a semipermeable barrier along a concentration gradient - that is, from an area of greater concentration to one of lower concentration.
-Only a small number of materials can pass through the plasma membrane by passive diffusion; if it were open to everything, it would not be a barrier. Yet cells need to control the movement of a variety of other molecules in and out of their membranes to maintain homeostasis. To do this, cells have devised a variety of transport systems that use proteins embedded in the lipid bilayer as gates for cells to open and close.
-There are three major types of transport systems in the plasma membrane: pumps, channels, and transporters. Pumps use the energy produced by the cell to move molecules against a concentration gradient. Channels open a gate for molecules to flow with their concentration gradient. Transporters bond to specific types of molecules and carry them through the membrane.
-More information in this link: https://sciencing.com/cell-compartmentalization-occur-7472001.html
-Hope this helps.
