Cell Transport

Front

What is the structure of the cell membrane?

Back

The cell membrane is composed of a phospholipid bilayer with hydrophobic lipid tails and hydrophilic heads, making it semi-permeable.

Front

What does it mean that the cell membrane is semi-permeable?

Back

It means that the cell membrane allows certain substances to pass through while blocking others.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells take in large amounts of material by engulfing it with the cell membrane.

Front

What is exocytosis?

Back

Exocytosis is the process of releasing large amounts of material from a cell using a vesicle that fuses with the cell membrane.

Front

What is active transport?

Back

Active transport is the movement of substances across a cell membrane against their concentration gradient, requiring energy (ATP).

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, moving down the concentration gradient.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move substances across the cell membrane.

Front

What role does ATP play in active transport?

Back

ATP provides the energy required for active transport to move substances against their concentration gradient.

Front

What is the sodium-potassium pump?

Back

The sodium-potassium pump is a type of active transport that pumps sodium ions out of the cell and potassium ions into the cell, using ATP.