The Cell Membrane.

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Cell membranes are composed of two phospholipid layers.
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Presentation transcript:

The Cell Membrane

Cell Membrane Basics Function: Controls the passage of materials into and out of a cell Semi-Permeable: only some materials may enter/exit Double layer of phospholipids (bilayer)

Phospholipid Composition 3 Parts Polar Head 1) Phosphate Group 2) Glycerol Nonpolar Tails 3) Two chains of fatty acids Arrangement: Outside: Polar heads (hydrophilic) Inside: Nonpolar Tails (hydrophobic)

Phospholipid Bilayer

Cell Membrane Contents 1) Cholesterol Molecules: strength 2) Carbohydrates: identification 3) Various Proteins

Membrane Proteins Randomly scattered through bilayer Various Functions Cytoskeleton: internal support Protein channels: allow objects to pass Enzymes: speed up chemical reactions Markers (carb. chains): cell recognition; fight disease

Receptor Proteins Help cells communicate Binds to ligands Two kinds EX: hormones, neurotransmitters Two kinds Membrane Intracellular

Draw, identify, label, & describe carbohydrate chain protein cholesterol protein protein channel cytoskeleton

Review Name the 3 parts to a phospholipid? Which part(s) make up the head of a phospholipid? Which part(s) make up the tails of a phospholipid? Which part of phospholipid always seems to be in contact with a watery environment? Why? Draw and label the basic components of the cell membrane. Which membrane protein supports the cell membrane? Which membrane protein allows materials to pass through?

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