What is a cell transport?
cell transport is an essential function of cells. It allows the cell to bring the molecule and individual atoms to the cell and send undesirable molecules and atoms from the cell. The barrier between the inside of the cell and the outer environment is the cell membrane. It regulates what can come into the cell. Cell transport can be a passive process that does not require energy, or it can be an active process that requires energy.
Passive transport does not require energy from the cell. It uses a concentration gradient to facilitate the passage of atoms or molecules through a cell membrane. In this type of cell transport, the cell interior has a low concentration of a particular molecule and the external environment has a high molecule concentration. There is a transport to balance the concentrations inside and out to achieve balance.
Simple diffusion is one type of passive transport. Individual molecules travel on a concentration gradient, from HBEZ any help passes through the cell membrane. Osmosis is a type of simple diffusion that specifically describes how molekWater uly pass through the cell membrane.
Another type of passive transport is called a facilitated diffusion. This type of cell transport uses protein in the cell membrane to transfer molecules to the cell. Glucose is one type of molecule that requires the membrane protein to pass through the cell membrane.
One type of cell transport that requires energy is called active transport. It describes transport processes that go against the concentration gradient, which means from low concentration to high concentration. Membrane proteins are required for this type of transport.
An example of active transport is a sodium pump in nerve cells. Normally, the sodium concentration is low in the cell and high outside the potassium whisthence cell is usually high inside the cell and low outside the cell. When the nerve pulse, sodium and potassium spread through the cell membrane along the concentration gradient. MakeHe returned the concentration gradient to his initial state, the membrane protein must constantly draw sodium from the cell and bring potassium to the cell. This requires energy from the cell.
other types of transport that require energy include vesicles. The vesicles are small bags that are made from the cellular Golgi apparatus. They collect waste products that exclude from the cell by joining the cell membrane. Vesicles can also be used to collect molecules that are outside the cell. In a process called endocytosis, it surrounds the cell membrane of the molecule and integrates it into the vesicles that separate from the membrane and enter the cell. The contents of the vesicles are then cleaved and released into the cell.