biology 3 chapter 1.1

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  • Osmosis is the diffusion of water
  • Water diffuses from a dilute solution to a more concentrated solution through a partially permable memebrane
  • Water moves into or out of cells by osmosis through the cell membrane

Active transport 

  • Active transport allows cells to take in substances against a concentration gradient 
  • Active transport uses energy from respiration
  • Ions, from dilute solution and other substances such as sugar can be absorbed by active transport 

The sports drink dilemma 

  • Most soft drinks contain: Water- to replace water lost


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