When transporting substances from low to high concentration, or when transporting substances too large to pass through the membrane without assistance from a transport protein.
The Active transport
Active Transport is carried out in our body cells. Active Transport uses energy to transport materials.
in the cells
Active Transport
active transport by endocytosis
Active because concentration in cells must remain hight than in the blood.
Just guess
Active transport
In the intestines, cells use active transport to pump nutrients such as glucose and amino acids from the intestinal lumen into the bloodstream. In the kidney, cells actively transport ions and small molecules from the blood into the nephron tubules for excretion in urine. In nerve cells, active transport is used to maintain the concentration gradients of sodium and potassium ions across the cell membrane, essential for nerve signaling.
Active transport processes, such as the sodium-potassium pump, require cells to expend energy in the form of ATP. The energy from ATP is needed to move molecules or ions against their concentration gradient, from an area of lower concentration to an area of higher concentration.
Mitochondria are what supplies energy to cells for active transport. ATP is the molecule that does this. Also known as adenosine triphosphate.
Cells use energy in the form of adenosine triphosphate (ATP) to perform active transport. This energy is required to move substances against their concentration gradient, from areas of lower concentration to areas of higher concentration. Active transport allows cells to maintain internal conditions and regulate the movement of molecules.