Cell Membrane & Transport Animations:

Cell Membrane:

Fluid Mosaic Model, Jesse Gray


Other Membrane Resources:

Passive Transport: Diffusion & Osmosis

How Diffusion Works. Answer questions below.

  1. Even in a lump of sugar, what do molecules do?

  1. How is diffusion defined? (Use concentration gradient in your answer).

  1. Draw a diagram to explain diffusion.

How Facilitated Diffusion Works.  Answer questions below.

  1. What does the protein do in facilitated diffusion?

  1. How much energy does facilitated diffusion require? (There must be a concentration gradient for particles, like amino acids, to move with diffusion).

  1. Draw a diagram to explain facilitated diffusion.

How Osmosis Works, answer the following questions below.

  1. How is osmosis different than other forms of diffusion?

  1. What particles move in what direction during osmosis?

  1. How does this compare to diffusion?

  1. What happens to water molecules in an isotonic solution?

Active Transport:

How the Sodium-Potassium Pump Works Answer questions below.

  1. What must be supplied to move sodium and potassium across the cell membrane from low concentration to high concentration?

  1. Is this example passive or active transport?

  1. How is this different than diffusion or osmosis?

  1. View the Example of the Sodium-Potassium Pump (click on active transport).  Draw a diagram or write a description of the example to explain active transport.

Endocytosis & Exocytosis:

View the McGraw Hill Animation and YouTube Video

  1. Describe the steps of endocytosis (a drawing may be helpful):

  1. Describe what takes place in exocytosis (a drawing may be helpful):

  1. Real Life Endocytosis Example (Amoeba Feeding). Explain how this amoeba (the blob) feeding represents endocytosis.

Cell to Cell Communication Example: Utah Genetics

Describe the role and process of cell to cell communication.

This is just entertaining and well done:

Plasma Membrane Rap