Active Transport

• What process allows substances to be absorbed against a concentration gradient?

  Active transport
• How does active transport differ from diffusion?

  Active transport moves substances against the gradient
• What is the energy source for active transport?

  Energy from respiration
• What is a concentration gradient?

  Difference in concentration across a space
• If a cell needs to absorb glucose from a high concentration inside, what process does it use?

  Active transport
• Why can't sugars diffuse into the cell from the lumen?

  Because their concentration is higher inside
• What do mitochondria provide for active transport?

  Energy
• What is the role of root hair cells in plants regarding active transport?

  They transport ions like magnesium from soil
• What do root hair cells need magnesium for?

  To make chlorophyll in leaves
• How are ions transported from root hair cells to the leaves?

  Through xylem vessels
• What is the lumen in the context of the small intestine?

  The cavity where food is digested
• How does the presence of mitochondria relate to active transport in cells?

  Mitochondria provide energy needed for transport