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Related Concept Videos

Osmosis00:47

Osmosis

192.9K
Approximately 60% to 95% of the weight of living organisms is attributed to water. Therefore, maintaining appropriate water balance within cells is of paramount importance. Osmosis is the movement of water across a semipermeable membrane, such as a cell’s plasma membrane. In living organisms, water plays a crucial role as a solvent—a molecule that dissolves other molecules.
192.9K
Osmosis01:30

Osmosis

10.4K
Osmosis is the movement of free water molecules through a semipermeable membrane.  The water's concentration gradient across the membrane is inversely proportional to the solutes' concentration. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane, and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion.
Water, like other substances, moves from a high concentration of...
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Osmosis and Osmotic Pressure of Solutions02:40

Osmosis and Osmotic Pressure of Solutions

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A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
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Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

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Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this...
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Diffusion01:12

Diffusion

216.9K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

Diffusion

6.3K
Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Evolution of Staircase Structures in Diffusive Convection
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Osmosis and diffusion conceptual assessment.

Kathleen M Fisher1, Kathy S Williams, Jennifer Evarts Lineback

  • 1Department of Biology, San Diego State University, CA 92182-4614, USA.

CBE Life Sciences Education
|December 3, 2011
PubMed
Summary

Student understanding of osmosis and diffusion mechanisms remains a challenge. A new Osmosis and Diffusion Conceptual Assessment (ODCA) was developed, showing similar results to a prior test, indicating persistent difficulties in biology education.

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Area of Science:

  • Biology Education
  • Cellular Biology

Background:

  • Mastery of diffusion and osmosis mechanisms is a known challenge for biology students.
  • Assessing student comprehension of these fundamental cellular processes is crucial for effective teaching.

Purpose of the Study:

  • To develop and validate a new assessment tool, the Osmosis and Diffusion Conceptual Assessment (ODCA), to measure student understanding.
  • To create an instrument that better aligns with current curriculum needs compared to existing tests.

Main Methods:

  • Developed an 18-item, two-tiered assessment (ODCA).
  • Modified existing items from the Diffusion and Osmosis Diagnostic Test (DODT) and created new items.
  • Validated the ODCA against established concepts and compared results to historical data.

Main Results:

  • The ODCA is a validated instrument with fewer items than the DODT.
  • Responses to ODCA items mirrored those from the DODT administered 15 years prior.
  • This suggests that student comprehension of osmosis and diffusion mechanisms has not significantly improved.

Conclusions:

  • Student mastery of diffusion and osmosis mechanisms remains elusive.
  • The ODCA provides a curriculum-aligned tool for assessing these concepts.
  • Further pedagogical strategies may be needed to enhance student understanding.