Biology B3 - Exchange of Materials

ACTIVE TRANSPORT

• Active Transport (AT) allows cells to move substances from a low concentration to a high concentration i.e against the concentration gradient (this is different to diffusion/osmosis which move with the concentration gradient)
• AT requires a type of energy known as ATP. which is produced uring respiration, in order to move molecules of sugar or ions across a membrane
• AT involves a transport protein grabbing a solute molecule from outside a cell and rotation to release the molecule into the cell
• Cyanide is a very poisonous substance which stops respiration. This in turn stops AT (as no ATP energy is produce) which means that cells cannot get the ions/nutrients that they need

ACTIVE TRANSPORT

• Active Transport (AT) allows cells to move substances from a low concentration to a high concentration i.e against the concentration gradient (this is different to diffusion/osmosis which move with the concentration gradient)
• AT requires a type of energy known as ATP. which is produced uring respiration, in order to move molecules of sugar or ions across a membrane
• AT involves a transport protein grabbing a solute molecule from outside a cell and rotation to release the molecule into the cell
• Cyanide is a very poisonous substance which stops respiration. This in turn stops AT (as no ATP energy is produce) which means that cells cannot get the ions/nutrients that they need

THE LUNGS

• The lungs are made up of a network of capillaries surrounding alveoli
• The alveoli are groups of "buds" and are where gaseous exchange takes place
• Because the alveoli are surrounded by capillaries, Oxygen and Carbon Dioxide can diffuse easily between the alveoles and blood
• The alveoli are adapted in many ways to increase the efficiency of gaseous exchange

THE LUNGS

• The lungs are made up of a network of capillaries surrounding alveoli
• The alveoli are groups of "buds" and are where gaseous exchange takes place
• Because the alveoli are surrounded by capillaries, Oxygen and Carbon Dioxide can diffuse easily between the alveoles and blood
• The alveoli are adapted in many ways to increase the efficiency of gaseous exchange