Forms a boundary between the cell and it's external environment. Made of two layers of lipids with the hydrophobic tails towards the inside.

Maintenance of constant internal conditions in an organism.

Allows materials to cross the cell membrane.

Allows some, but not all, materials to cross the cell membrane.

Structures that are embedded in the cell membrane. Can be used as pores or pumps to let molecules into and out of the cell.

Drives molecules across a membrane from a region of lower concentration to a region of higher concentration.

Against concentration gradient

The way molecules move during active transport.

The process of taking liquids or fairly large molecules into the cell by engulfing them in a membrane.

The release of substances out of a cell by the fusion of a vesicle with the membrane.

ATP. Needed for active transport.

Used during active transport to allow molecules against a concentration gradient.

The movement of molecules across a cell membrane without energy input from the cell.

The movement of molecules in a fluid or gas from a region of high concentration to a region of lower concentration.

The movement of water from lower concentration of solutes to an area of higher concentration solutes through a membrane.

The solution has an equal concentration of dissolved particles as the cell. Water moves across the membrane at the same rate.

Solution has a higher concentration of dissolved particles as the cell so the water flows out of the cell.

Solution has a lower concentration of dissolved particles as the cell so the water flows into the cell.

Facilitated diffusion

Diffusion of molecules across a membrane through transport proteins.

With Concentration Gradient

The way molecules move during passive transport.

A substance that dissolves into a solvent.

The substance that is present in the greater amount that dissolves another substance.

The condition of a system in which competing influences are balanced, resulting in no net change

The maintenance of constant internal conditions in an organism.

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04. Cell Transport

Cell Transport

Term	Definition
Phospholipid bilayer	Forms a boundary between the cell and it's external environment. Made of two layers of lipids with the hydrophobic tails towards the inside.
Homeostasis	Maintenance of constant internal conditions in an organism.
Permeable	Allows materials to cross the cell membrane.
Semipermeable	Allows some, but not all, materials to cross the cell membrane.
Protein	Structures that are embedded in the cell membrane. Can be used as pores or pumps to let molecules into and out of the cell.
Active transport	Drives molecules across a membrane from a region of lower concentration to a region of higher concentration.
Against concentration gradient	The way molecules move during active transport.
Endocytosis	The process of taking liquids or fairly large molecules into the cell by engulfing them in a membrane.
Exocytosis	The release of substances out of a cell by the fusion of a vesicle with the membrane.
Energy	ATP. Needed for active transport.
Pump	Used during active transport to allow molecules against a concentration gradient.
Passive transport	The movement of molecules across a cell membrane without energy input from the cell.
Diffusion	The movement of molecules in a fluid or gas from a region of high concentration to a region of lower concentration.
Osmosis	The movement of water from lower concentration of solutes to an area of higher concentration solutes through a membrane.
Isotonic	The solution has an equal concentration of dissolved particles as the cell. Water moves across the membrane at the same rate.
Hypertonic	Solution has a higher concentration of dissolved particles as the cell so the water flows out of the cell.
Hypotonic	Solution has a lower concentration of dissolved particles as the cell so the water flows into the cell.
Facilitated diffusion	Diffusion of molecules across a membrane through transport proteins.
With Concentration Gradient	The way molecules move during passive transport.
High to low	The way molecules move during passive transport.
Solute	A substance that dissolves into a solvent.
Solvent	The substance that is present in the greater amount that dissolves another substance.
Equilibrium	The condition of a system in which competing influences are balanced, resulting in no net change
Homeostasis	The maintenance of constant internal conditions in an organism.

Created by: cfhsbiology

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