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006 - Cell Membrane

Cell Membrane and Transport

  • The cell membrane is composed of phospholipids and proteins.

    • Phospholipids are arranged in a phospholipid bilayer.

    • The membrane is made up of hydrophilic phosphate heads and hydrophobic lipid tails.

    • The membrane is fluid, allowing for movement of substances.

The Fluid Mosaic Model

  • Proposed in 1972.

  • The cell membrane is fluid and can flow around objects.

  • The cell membrane is a mosaic of components, including phospholipids, proteins, carbohydrates, and cholesterol.

Cell Membrane Function

  • Retains cell contents.

  • Acts as a selective barrier, regulating the movement of materials into and out of the cell.

Selective Transport

  • Movement across the cell membrane is called selective transport.

  • Membranes can be classified as impermeable, permeable, or semi-permeable.

Phospholipid Molecule

  • Consists of a hydrophilic phosphate head and a hydrophobic lipid tail.

  • This chemical makeup accounts for the fluidity of the membrane and its arrangement.

Phospholipid Bilayer

  • Phospholipids arrange themselves into a phospholipid bilayer.

  • The lipid tails point inward, away from water.

  • The phosphate heads point outward, towards water.

  • Various types of proteins are embedded in the bilayer.

Membrane Proteins

  • Variety of proteins are embedded within the lipid layers.

  • Membrane proteins serve various functions.

Cell Membrane Labels

  • A fluid mosaic model of membrane structure.

  • A three-dimensional model of membrane structure.

  • Labels for phospholipids, hydrophilic heads, hydrophobic tails, hydrophobic regions of proteins, hydrophilic regions of proteins, glycolipids, glycoproteins, lipid bilayer, external layer, internal layer, and

006 - Cell Membrane

Cell Membrane and Transport

  • The cell membrane is composed of phospholipids and proteins.

    • Phospholipids are arranged in a phospholipid bilayer.

    • The membrane is made up of hydrophilic phosphate heads and hydrophobic lipid tails.

    • The membrane is fluid, allowing for movement of substances.

The Fluid Mosaic Model

  • Proposed in 1972.

  • The cell membrane is fluid and can flow around objects.

  • The cell membrane is a mosaic of components, including phospholipids, proteins, carbohydrates, and cholesterol.

Cell Membrane Function

  • Retains cell contents.

  • Acts as a selective barrier, regulating the movement of materials into and out of the cell.

Selective Transport

  • Movement across the cell membrane is called selective transport.

  • Membranes can be classified as impermeable, permeable, or semi-permeable.

Phospholipid Molecule

  • Consists of a hydrophilic phosphate head and a hydrophobic lipid tail.

  • This chemical makeup accounts for the fluidity of the membrane and its arrangement.

Phospholipid Bilayer

  • Phospholipids arrange themselves into a phospholipid bilayer.

  • The lipid tails point inward, away from water.

  • The phosphate heads point outward, towards water.

  • Various types of proteins are embedded in the bilayer.

Membrane Proteins

  • Variety of proteins are embedded within the lipid layers.

  • Membrane proteins serve various functions.

Cell Membrane Labels

  • A fluid mosaic model of membrane structure.

  • A three-dimensional model of membrane structure.

  • Labels for phospholipids, hydrophilic heads, hydrophobic tails, hydrophobic regions of proteins, hydrophilic regions of proteins, glycolipids, glycoproteins, lipid bilayer, external layer, internal layer, and