Biology B3 - Exchange of Materials

Notes on Unit One for Biology C3 on exchange of materials in plants and humans e.g active transport.

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  • Created by: Kate
  • Created on: 20-04-10 15:50

Active Transport

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
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Active Transport

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
2 of 4

The Lungs

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
3 of 4

The Lungs

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
4 of 4

Comments

Nikita

thanks, some good information here

but, you have repeated both of the slides :P

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