An ion must cross the cell membrane through active transport instead of passive transport when it is moving against its concentration gradient, meaning it is moving from an area of lower concentration to an area of higher concentration. Active transport requires energy, typically in the form of ATP, to facilitate this movement. This process is essential for maintaining cellular homeostasis and regulating ion concentrations within the cell.
It's called passive transport for a cell's membrane. (I checked with my science teacher)
Passive transport is a process in cells where substances move across the cell membrane without requiring energy input. An example of passive transport is the movement of oxygen and carbon dioxide across the cell membrane through simple diffusion.
proteins
Carbon dioxide can diffuse passively through the cell membrane due to its small size and nonpolar nature. Water molecules can pass through the membrane via osmosis, a type of passive transport. Sodium ions are transported against their concentration gradient through active transport processes such as sodium-potassium pumps that require ATP for energy.
In an active transport, the cell uses energy (ATP) to transport the particle into the cell. Also, the particle moves through a "hallway" type thing. In a passive transport, the cell does not need energy (ATP) to transport the particle into the cell. Also, the particle just bursts through the cell membrane to get inside.
Osmosis
Passive transport does not use energy to pass through a cell membrane. active transport uses energy to pass through a cell membrane.
passive transport
Diffusion is an example of passive transport, like osmosis(the diffusion of water through a membrane).
The cell membrane, also known as the plasma membrane, is responsible for regulating the movement of water and substances through processes like active transport and passive transport. It acts as a selectively permeable barrier, allowing certain molecules to pass through while blocking others.
The passive transport of water through a biological membrane is called osmosis.
If you mean the opposite of passive transport, like through a membrane, the opposite is active transport.
It's called passive transport for a cell's membrane. (I checked with my science teacher)
Transport through aquaporins is passive, as water molecules move across the cell membrane through these channels driven by osmotic gradients without the need for energy expenditure.
Carrier proteins facilitate passive transport of molecules across a membrane by changing its shape, by using ATP, to allow a substance to pass through the membrane.
Osmosis, Passive Transport, and Active Transport
Passive transport is a process in cells where substances move across the cell membrane without requiring energy input. An example of passive transport is the movement of oxygen and carbon dioxide across the cell membrane through simple diffusion.