Active Transport

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, using energy in the form of ATP.

Front

What are cell membrane pumps?

Back

Cell membrane pumps are proteins that transport ions or molecules across the cell membrane against their concentration gradient.

Front

What is the sodium-potassium pump?

Back

The sodium-potassium pump is a type of active transport that moves sodium ions out of the cell and potassium ions into the cell, crucial for maintaining cellular function.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a passive transport process that allows substances to cross membranes with the assistance of special proteins.

Front

What is endocytosis?

Back

Endocytosis is an active transport process where cells engulf substances from the outside environment, forming a vesicle.

Front

What is exocytosis?

Back

Exocytosis is the process by which a cell expels materials in vesicles, releasing them into the extracellular space.

Front

What role do proteins play in the cell membrane?

Back

Proteins in the cell membrane function as channels, carriers, and receptors, facilitating transport and communication.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their gradient.

Front

What is osmosis?

Back

Osmosis is the passive movement of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is the significance of maintaining a negative charge inside muscle cells?

Back

Maintaining a negative charge inside muscle cells is essential for proper nerve signal transmission and muscle contraction.