3.5 bio

​A. Active Transport- requires energy by cell to move materials in or out of cell.

​ 1.Can use transport proteins to move molecules against concentration gradient (from low to high)

2. Use energy from ATP molecule

​B. Endocytosis- Movement of liquids or large molecules into a cell by engulfing them in a membrane

  1. Phagocytosis- “cell eating”

​ a. Key role in immune system (white blood cells)

b. Cell membrane make “pocket” around materia

2. Exocytosis- opposite of endocytosis

a. Release of substances from cell

b. vesicle moves to cell membrane, fuses,   and then lets go of its contents out of the cell.

c. Occurs constantly in your body (release of   neurotransmitters during nerve impulse)