Cell Membrane and Cell Division Fundamentals

📋 Course Outline

1. Cell Membrane Structure
2. Membrane Transport Types
3. Diffusion and Osmosis
4. Facilitated Diffusion and Active Transport
5. Tonicity and Water Movement
6. Sodium-Potassium Pump
7. Cell Division Reasons
8. Cell Cycle Phases
9. Mitosis Stages
10. Meiosis and Genetic Variation

📖 1. Cell Membrane Structure

🔑 Key Concepts & Definitions

• Phospholipid Bilayer: A double layer of phospholipids with hydrophilic heads facing outward and hydrophobic tails inward, forming the fundamental structure of the cell membrane.
• Amphipathic Molecules: Molecules that have both hydrophilic (water-loving) and hydrophobic (water-fearing) regions, essential for membrane formation.
• Integral Proteins: Proteins embedded fully within the phospholipid bilayer, often spanning the membrane, involved in transport and signaling.
• Peripheral Proteins: Proteins attached temporarily to the membrane's exterior or interior surfaces, involved in support and signaling.
• Receptor Proteins: Proteins that bind signaling molecules (ligands) and trigger cellular responses, crucial for communication.
• Factors Affecting Diffusion: Conditions influencing the movement of molecules across the membrane, including concentration gradient, temperature, molecule size, and surface area.

📝 Essential Points