Based on the movement of water across a selectively permeable membrane lab, what is the definition of a selectively permeable membrane?

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08-09-2024
Biology

High School

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Based on the movement of water across a selectively permeable membrane lab, what is the definition of a selectively permeable membrane?

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NimishaJain NimishaJain · Answer 1 · 2024-03-31T05:33:08-04:00

A selectively permeable membrane is a barrier that allows certain substances to pass while blocking others, crucial for cell membrane function and physiological processes such as osmosis.

Definition of Selectively Permeable Membrane

A selectively permeable membrane is a biological term that describes a barrier that allows only certain substances to pass through while preventing the movement of others. This characteristic is vital for the function of cell membranes in living organisms, which permit the transport of water and small molecules. For instance, during osmosis, water can move across a selectively permeable membrane due to the concentration gradient; that is, it flows from a region of lower solute concentration to a region of higher solute concentration until equilibrium is reached. Not all molecules can pass freely; some require specific transport proteins, channels, or additional energy to cross the barrier.

This concept is often explored in labs where the movement of water through the membrane illustrates osmosis. The membrane's selective permeability is essential in regulating the internal environment of cells, contributing to homeostasis, and is also important in various physiological processes such as the function of kidney tubules and red blood cells where aquaporins play a significant role.