Membranes & Transport - Transport III (Part 1) | BIALIGY.com

About this video

• Video Title: Membranes & Transport - Transport III (Part 1) | BIALIGY.com
• Channel: BIALIGY
• Speakers: (None explicitly mentioned in the transcript)
• Duration: 00:09:22

Overview

This video introduces "Transport 3," focusing on carrier-mediated transport as a method for moving molecules across cell membranes. It explains the limitations of passive transport for large molecules and charged ions, then details how carrier proteins facilitate this process, including both passive and active forms. The video also provides examples of facilitated diffusion, such as aquaporins, GLUT1, and ion channels.

Key takeaways

• Limitations of Passive Transport: Passive transport is not effective for large molecules like glucose or charged ions due to their size, polarity, or charge.
• Carrier-Mediated Transport: This process utilizes specific transport proteins (carrier proteins) embedded in the cell membrane to move molecules. These proteins allow specific molecules to avoid direct contact with the lipid bilayer.
• Facilitated Diffusion: A passive form of carrier-mediated transport that still relies on a concentration gradient but uses transport proteins to move molecules across the membrane.
• Process of Facilitated Diffusion: Involves the solute binding to a transport protein, causing a conformational change in the protein, opening a channel, and allowing the solute to pass through the membrane.
• Examples of Facilitated Diffusion: Aquaporins for water transport, GLUT1 for glucose transport, and ion channels for ions like potassium.