Transport Across the Cell Membrane Passive vs Active

Transport Across the Cell Membrane Passive vs. Active Transport

I. Passive Transport • Is energy (ATP) required? _____ NO • Moves molecules across the membrane ____ DOWN a concentration gradient. HIGH LOW • From ____ concentration to _______ concentration.

Easy Breezy

Passive Transport Osmosis High to Low concentration Equilibrium High to Low concentration assisted proteins Equilibrium Water moves both ways Cell doesn’t change in size Water moves into the cell Cell swells & bursts (lysis) Water moves out of the cell Cell shrinks (shrivels)

II. Active Transport YES • Is energy (ATP) required? _____ • Moves molecules across the membrane AGAINST a concentration gradient. ____ LOW HIGH • From ____ concentration to _______ concentration.

Sooooo Tired

Active Transport Type Protein Pump Endocytosis Exocytosis Movement Ions are pumped out of the cell, while other ions are brought in (Ex. Na+ & K+) Large molecules are engulfed by the membrane (brought into the cell) Large molecules are secreted (exit the cell) by the membrane

STUDENT PRACTICE Do #1 -5 on back of notes page.

1. Freshwater moves into a paramecium PASSIVE Active or Passive? ________ Method: _________ OSMOSIS

2. Carrier proteins transport glucose into a muscle cell. high low PASSIVE Active or Passive? ________ FACILITATED DIFFUSION Method: __________

3. An amoeba engulfs a large particle of food. ACTIVE Active or Passive? ________ ENDOCYTOSIS Method: _________

4. Oxygen molecules move from the lungs into the bloodstream. high low PASSIVE Active or Passive? ________ Method: __________ DIFFUSION

5. Sodium ions are pumped out of a red blood cell. low high Active or Passive? ________ ACTIVE PROTEIN PUMP Method: __________

6. Proteins are secreted from a cell. ACTIVE Active or Passive? ________ EXOCYTOSIS Method: __________