Ch 2 L3 Cell Transport

Endocytosis is the process by which a cell takes in a substance by surrounding it with its cell membrane.

Active transport is the movement of substances from an area of low concentration to an area of high concentration, requiring energy.

Osmosis is the diffusion of water molecules across a selectively permeable membrane.

Water molecules can pass through the cell membrane because they are small in size.

As a cell gets bigger, its surface area increases.

Diffusion is the process by which molecules move from an area of high concentration to an area of low concentration.

Passive transport does not require energy and moves substances from high to low concentration, while active transport requires energy to move substances from low to high concentration.

Cell membranes control the movement of substances in and out of the cell, allowing for selective permeability.

A selectively permeable membrane is a barrier that allows certain substances to pass while blocking others.

Concentration gradients drive the movement of substances during diffusion and osmosis, influencing how materials enter and exit cells.