transport study guide

 

 The process of diffusion requires

a difference in the concentration gradient of molecules throughout a space

 

 If the molecule concentration of a substance is the same throughout a space, the substance

is in equilibrium

 

A cell membrane is permeable to carbon dioxide (CO2 ).  If there is a greater concentration of CO2  inside the cell than outside the cell, CO2  will:

diffuse out of the cell

All forms of passive transport depend on

the kinetic energy of molecules

Sodium-Potassium pumps

move Na+ ions out of cells and K+ ions into cells

 

The energy needed to power the sodium-potassium pump is provided by the

splitting of ATP

Substances that can pass through cell membranes by diffusion include

Oxygen

What is a concentration gradient?

difference in concentration of a substance across a space

A type of transport in which water moves across a membrane and down its concentration gradient is

osmosis

Facilitated diffusion is often used to transport

molecules that are not soluble in lipids

 

What is the difference between passive and active transport?

passive transport moves things from high to low concentrations

 

What is the difference between endocytosis and exocytosis?

endocytosis is when large molecules enter a cell

The diagram below represents a

Hypotonic Solution

The diagram below represents a

Isotonic Solution

 

The diagram above represents a

Hypertonic Solution