#CellMembrane #PlasmaMembrane #cellbiology

Cell or Plasma Membrane | Structure , Function & Transport

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00:00:00 Cell membrane structure: Nucleus, Cytoplasm; Lipid Bilayer structure, concept of polar and nonpolar structure. Hydrophilic & Hydrophobic components.

00:09:12 Movement across the membrane; Lipid soluble, small molecular weight substances. Charged and uncharged molecules.

00:12:47 Protein transporters, channels. Details of different types of lipids in outer and inner parts of membrane; Asymmetric cell membrane.

00:21:06 Cholesterol in cell membrane. "Fluidity" of membrane; this mobility helps in seamless transport of hormones (like Insulin) without permanent change in membrane. [Exocytosis & Endocytosis]. Membrane biogenesis.

00:29:00 Factors altering fluidity of membrane: Temperature, increasing cholesterol content reduces fluidity. Saturated Fatty Acids decrease fluidity.

00:34:00 Macromolecules; Receptors in cell membrane. e.g., Insulin, epinephrine.

00:41:30 Receptors within cell. e.g., thyroxine; substances that can pass through cell membrane have their receptor within the cell. Lipid Raft; Receptor along with its associated proteins.

00:44:50 Integral proteins; Transmembrane proteins, Peripheral proteins; loosely attached with the membrane.

00:50:20 Some more details on Integral Protein; Carrier proteins, Channels, Enzyme (within cell membranes), Linker proteins (role in maintaining cytoskeleton), Receptors

01:03:15 Peripheral Proteins; cytoskeleton, 2nd messenger system

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