Doctor's Notes 2

Now that we understand what passive transport is, let’s learn about active transport! 

• Active transport always requires energy (ATP) 
• Molecules move up the concentration gradient, in other words, molecules move from low to high concentration gradients. 
• Has three forms; ion pumps (also known as Sodium-Potassium Pumps), endocytosis, and exocytosis. 
• Sodium-Potassium Pumps- transport sodium and potassium ions up the concentration gradient.
• Endocytosis- molecules/particles enter the cell membrane (ex. an amoeba goes through endocytosis when it eats a piece of algae)
• Exocytosis- molecules/particles exit the cell and are released outside.

Sodium-Potassium Pumps

Endocytosis

Exocytosis