BIOL-L 101: Notes Part 5 - Endocytosis

Endocytosis

is a process by which a cell Surrounds a substance in the outside, engulfing and enclosing in a portion of the plasma membrane, the membrane then pinches off, resulting a vacuole. The vacuole with its contents moves inside the cell. Protein Plasma Membrane vacuole Outside Large substances can enter a cell by endocytosis. inside carrier proteins, commonly known as pumps, are active. They pick up and move substances across the plasma membrane into the cell.

Nat/K ATPase pump

The Sodium-potassium ATPase pump is an active transport pump found in animals cells. The pump maintains the level of Sodium and potassium ions inside the cell. Outside 888888

Exocytosis

is the secretion of materials at the plasma membrane. It's the reverse of endocytosis It expel wastes. inside (3) 8888888 inside 6 ATP Na* exeert outside inside Both of them require the input of energy cells, Maintain homeostasis by moving the substances into and out of the cell. Carrier Proteins *next page 000 000 inside