About this video

• Video Title: Membranes & Transport - Transport I | BIALIGY.com
• Channel: BIALIGY
• Speakers: None listed
• Duration: 00:09:28

Overview

This video introduces the concept of transport across cell membranes. It explains that cell membranes are selectively permeable and that transport is crucial for cells to function. The video categorizes transport into two main types: passive and active, and then begins to explore subtypes, starting with diffusion.

Key takeaways

• Selectively Permeable Membrane: The cell membrane controls what enters and exits the cell, acting as a "gatekeeper."
• Two Main Transport Types: Transport across the cell membrane is broadly divided into passive transport (no metabolic energy required, relies on concentration gradient) and active transport (requires metabolic energy).
• Diffusion: This is a type of passive transport where molecules spread out into available space.
• Movement Down Concentration Gradient: The net movement of molecules during diffusion is always from an area of high concentration to an area of low concentration until equilibrium is reached.
• Simple Diffusion: This specific type of diffusion occurs across the cell membrane, often with gases (like oxygen and carbon dioxide) and small nonpolar or small polar uncharged molecules.