SWBAT describe membrane structure

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Presentation transcript:

SWBAT describe membrane structure

Cell Membranes Structure

Functions of the cell membrane Separates living cell from surrounding environment

Functions of the cell membrane Controls what can enter and exit cell Selectively permeable allows some substances to cross more easily than others

Functions of the cell membrane Communicate with other cells Send and receive messages—like cortisol

Key to membrane function is its structure Made of phospholipids, proteins & other macromolecules

What is a phospholipid? Phospho = phosphate “head” Lipid = fatty acid “tail”

What is a phospholipid? Phosphate head hydrophilic: loves water Fatty acid tail hydrophobic: hates water So phospholipids arrange as a bilayer Keeps outside liquid out and inside liquid in!

Membrane structure Membrane has other molecules embedded in phospholipid bilayer -Carbohydrates -***Proteins!

Membrane Proteins 1. Gatekeepers: determine what particles can pass through the membrane. 2. Enzymes (speed up reactions). 3. Cell recognition and signaling (the immune system).

Fluid mosaic model Fluid: phospholipids and other molecules move within bilayer Mosaic: made of different pieces

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