transport across cell membranes

What does selectively permable mean

Some substances move freely cross the cell memebrane in or out of the cell, while other substances cannot

High to low concentration

Down concentration gradient

Low to high concentration

Against concentration gradient

What is passive transport

The movement of molecules from a high to low concentration down a concentration gradient without using energy

What is diffusion

The movement of molecules from a high area of concentration to a low area of concentration down a concentration gradient

Why is diffusion important

It allows living cells to gain gain oxygen and glucose, leaving carbon dioxide and waste out

Why do Glucose, Oxygen and Amino acids move into the cell

Because the concentration outside the cell is higher than outside

What is osmosis

Is the movement of water from an area of high concentration to low concentration down a water concentration gradient