Cell Transport

Cell Transport Cell Membrane protects the cell maintains the shape of the cell controls what enters and leaves the cell

Cell Transport Semi-permeability only lets certain materials pass through; like a strainer Small Molecules  pass through easily (water, oxygen, carbon dioxide) Large Molecules  cannot pass through (starch and proteins)

Cell Transport What is a cell membrane made of? Lipids (fat) and proteins FLUID MOSAIC MODEL

How do substances pass through a cell membrane? Cell Transport How do substances pass through a cell membrane? The cell membrane is fluid (soft). Tiny gaps form between the fat molecules and allow small substances to pass through. The proteins act as doorways for larger molecules.

Two Types of Transport: Passive Transport Does not require energy High concentration  Low concentration Through gaps in lipid molecules Generally known as diffusion If the process involves water - osmosis “Things will flow from high to low.”

Two Types of Transport: Active Transport Requires energy Low concentration  High concentration Materials pass through carrier proteins

Diffusion