Biology unit 3 2.0 / 5 based on 1 rating ? BiologyGCSEAll boards Created by: Lauren ReidCreated on: 04-04-11 20:29 what is active transport? where substances need to be moved from an area of high concentration to an area of low concentration against a concentration gradient. NEEDS ENERGY--- this comes from cellular respiration 1 of 3 two situations it happens in: against a concentration gradient when a molecule is too large to move through the particually-permiable membrane 2 of 3 How are your lungs adapted to make gas exchange as they have ALVEOLI which are adapted to make it as efficient as possible o2 into blood by diffusion thin alveoli walls to make it as easy as possible co2 out by diffusion moist so it can disolve large surface area 3 of 3
Comments
No comments have yet been made