Membranes & Transport - Transport II (Part 2) | BIALIGY.com

About this video

• Video Title: Membranes & Transport - Transport II (Part 2) | BIALIGY.com
• Channel: BIALIGY
• Speakers: None listed
• Duration: 00:12:28

Overview

This video explains the concept of osmosis, a type of passive transport, and how it specifically applies to animal and plant cells. It details the consequences of placing cells in hypotonic, hypertonic, and isotonic environments, highlighting the crucial role of the cell wall in plant cells and its absence in animal cells.

Key takeaways

• Osmosis as Passive Transport: Osmosis is the diffusion of water across a semipermeable membrane and is a form of passive transport.
• Animal Cells in Different Environments:
  • In a hypotonic environment, water rushes into the animal cell, causing it to swell and potentially lyse (burst).
  • In a hypertonic environment, water leaves the animal cell, causing it to shrivel and die.
  • In an isotonic environment, there is no net movement of water, and the cell remains stable.
• Plant Cells in Different Environments:
  • In a hypotonic environment, water enters the plant cell, but the rigid cell wall prevents it from bursting, creating turgor pressure which keeps the cell healthy and plump.
  • In a hypertonic environment, water leaves the plant cell, causing the plasma membrane to pull away from the cell wall, a process called plasmolysis, leading to wilting and eventual death.
  • In an isotonic environment, there is no net movement of water, resulting in a lack of turgor pressure and a limp appearance.
• Role of the Cell Wall: The cell wall in plant cells provides structural support, preventing bursting in hypotonic solutions and allowing for turgor pressure. However, it does not prevent water from leaving the cell in hypertonic conditions, leading to plasmolysis.