High School

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What is the term used to describe a difference in water concentration between two locations separated by a semi-permeable membrane?

Answer :

The term used to describe a difference in water concentration between two locations separated by a semi-permeable membrane is 'osmosis.'

Osmosis is a fundamental concept in biology and refers to the passive movement of water molecules across a semi-permeable membrane from an area of higher water concentration to an area of lower water concentration.

Here's a step-by-step breakdown:

  1. Semi-permeable Membrane: This is a type of barrier that allows certain molecules or ions to pass through it by diffusion and occasionally specialized 'facilitated diffusion.' In the context of osmosis, it allows the passage of water but not solutes (dissolved substances).

  2. Water Concentration Gradient: Osmosis occurs when there is a gradient, meaning a difference in water concentration on both sides of the membrane. One side has more water (higher concentration) and the other side has less water (lower concentration).

  3. Movement of Water: Water moves from the area of higher concentration to the area of lower concentration through the semi-permeable membrane. This movement aims to equalize the concentrations on both sides of the membrane.

  4. Importance in Biology: Osmosis is crucial for maintaining cell structure and function. For example, it helps in the regulation of the internal conditions of a cell and the transport of nutrients and waste products in and out of cells.

Understanding osmosis is vital for high school students as it provides insight into how cells interact with their environment and maintain homeostasis. It also lays the foundation for understanding more complex biological processes.

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