biology 3 chapter 1.1

Osmosis

• 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…