The movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy from cellular respiration
Active transport
Occurs across a membrane
Requires special proteins in the membrane to transfer molecules
Cellular respiration
Provides the energy for active transport
ATP
Molecules that store the energy from cellular respiration and transport it to different parts of the cell
Root hair cells
Have a large surface area for absorption
Have many mitochondria to provide energy for active transport
Active transport in root hair cells
1. Absorb water and mineral ions from the soil
2. Against their concentration gradient
3. Using energy from cellular respiration
Root hair cells need to absorb mineral ions like magnesium and nitrates at a higher concentration inside the cell than outside in the soil
