Active transport

• Active transport


  It is another mechanism by which substances can move into and out of cells.

  
• What type of process is active transport and what does this mean?

  Active transport is an active process which means it requires energy from respiration to power it.
• When does active transport occur?

  Active transport occurs when a substance must be moved from an area of lower concentration to an area of higher concentration through a cell membrane.

  
• Name and explain an example of active transport.

  The roots of a plant. Mineral ions in the soil are at a low concentration compared to the cytoplasm of the plant cell.
• Name and explain another example of active transport.

  The small intestine. This is to ensure that all glucose that has been made available by digestion is absorbed into the blood.
• Word equation for respiration

  glucose + oxygen --> carbon dioxide + water + energy
• What way does diffusion and osmosis move regarding the concentration gradient compared to active transport?

  Diffusion and osmosis moves down the concentration gradient so doesn't require energy but active transport moves up (against) the concentration gradient so it requires energy from respiration.
• Where do diffusion and osmosis move from compared to active transport regarding water?

  Diffusion and osmosis moves from where there is more water to less water. However, active transport moves from less water to more water.