active transport

• Passive transport


  Substances transported down concentration gradients
• Active transport


  A process required to move molecules against a concentration gradient, which requires energy
• Active transport in plants

  1. Mineral ions moved into root hairs

  2. Ions in higher concentration than in dilute soil solutions

  3. Active transport across root to take in needed ions from soil
• Active transport in animals

  1. Glucose molecules moved across gut wall into blood

  2. Glucose concentration in intestine might be higher or lower than in intestinal cells and blood

  3. All glucose in gut needs to be absorbed

  4. When glucose concentration in intestine is lower, movement involves active transport requiring energy from respiration
• Passive transport


  Substances transported down concentration gradients
• Active transport


  A process required to move molecules against a concentration gradient, which requires energy
• Active transport in plants

  1. Mineral ions moved into root hairs

  2. Ions in higher concentration than in dilute soil solutions

  3. Active transport across root to take in needed ions from soil
• Active transport in animals

  1. Glucose molecules moved across gut wall into blood

  2. Glucose concentration in intestine might be higher or lower than in intestinal cells and blood

  3. All glucose in gut needs to be absorbed

  4. When glucose concentration in intestine is lower, movement involves active transport requiring energy from respiration