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Cell Membrane Honors Biology.

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Presentation on theme: "Cell Membrane Honors Biology."— Presentation transcript:

1 Cell Membrane Honors Biology

2 Cell Size Most cells are very small. Why don’t we have huge cells?
What’s the limiting factor? Honors Biology

3 Cell Size Cells want a HIGH surface to volume ratio.
Smaller IS better! Cells want a HIGH surface to volume ratio. Honors Biology

4 Membrane Overview Cell membrane separates living cell from nonliving surroundings thin barrier Controls traffic in & out of the cell selectively permeable allows some substances to cross more easily than others Made of phospholipids, proteins & other macromolecules Honors Biology

5 Cell Membrane’s A.K.A.’s The cell membrane has a lot of names!
Plasma membrane Phospholipid Bilayer Cytoplasmic Membrane Honors Biology

6 Aaaah, one of those structure–function
Phospholipids Phosphate Fatty acid tails Nonpolar & hydrophobic Phosphate group head Polar & hydrophilic Arranged as a bilayer Fatty acid Aaaah, one of those structure–function examples Honors Biology

7 Phospholipid bilayer polar hydrophilic heads nonpolar hydrophobic
tails polar hydrophilic heads Honors Biology

8 Filaments of cytoskeleton
Membrane is a collage of proteins & other molecules embedded in the fluid matrix of the lipid bilayer Marker Protein Extracellular fluid Phospholipids Receptor Proteins The carbohydrates are not inserted into the membrane -- they are too hydrophilic for that. They are attached to embedded proteins -- glycoproteins. Filaments of cytoskeleton Cholesterol Transport Protein Cytoplasm Honors Biology

9 Cell Membrane Proteins
Transport Proteins - allow molecules to cross through the membrane Receptor Protein - Transfer information from one side to the other Marker Protein - Identification for the cell Honors Biology

10 Marker Protein Transport Protien Receptor Protein
Honors Biology

11 Bilayer Characteristics
Two important characteristics Selectively Permeable - regulates the molecules that enter and leave, thereby helping to maintain homeostasis Has Fluidity - Flexible, able to move, and to change cell shape (due to lipids) Fluid Mosaic Model! Honors Biology

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