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Biology: Diffusion and Osmosis

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9 Questions

What is diffusion?

The movement of particles from an area of higher concentration to an area of lower concentration.

What type of diffusion involves the assistance of transport proteins?

Facilitated Diffusion

What is the movement of water molecules through a selectively permeable membrane from an area of higher concentration to an area of lower concentration?

Osmosis

What is the difference in concentration of particles between two areas?

Concentration Gradient

Which of the following increases the kinetic energy of particles, increasing the diffusion rate?

Increased Temperature

What is the significance of diffusion in cellular functions?

All of the above

What is an example of diffusion in biological systems?

All of the above

What is the result of diffusion?

Uniform Distribution

What is a factor that increases the rate of diffusion?

Increased Surface Area

Study Notes

Diffusion

Definition

  • Diffusion: the random movement of particles from an area of higher concentration to an area of lower concentration, resulting in uniform distribution.

Types of Diffusion

  • Simple Diffusion: movement of particles through a medium without the assistance of transport proteins.
  • Facilitated Diffusion: movement of particles through a medium with the assistance of transport proteins.
  • Osmosis: movement of water molecules through a selectively permeable membrane from an area of higher concentration to an area of lower concentration.

Factors Affecting Diffusion

  • Concentration Gradient: the difference in concentration of particles between two areas.
  • Temperature: increased temperature increases the kinetic energy of particles, increasing diffusion rate.
  • Surface Area: increased surface area provides more opportunities for particles to interact and diffuse.
  • Particle Size: smaller particles diffuse more quickly due to increased kinetic energy and smaller size.

Importance of Diffusion

  • Cellular Functions: diffusion plays a crucial role in maintaining cellular homeostasis, regulating pH, and transporting nutrients and waste.
  • Biological Systems: diffusion is essential for the functioning of organs, tissues, and entire organisms.

Examples of Diffusion

  • Gas Exchange: diffusion of oxygen and carbon dioxide in the lungs.
  • Nutrient Uptake: diffusion of nutrients into cells.
  • Waste Removal: diffusion of waste products out of cells.

Diffusion

Definition

  • Diffusion is the random movement of particles from an area of higher concentration to an area of lower concentration, resulting in uniform distribution.

Types of Diffusion

  • Simple Diffusion: movement of particles through a medium without transport proteins.
  • Facilitated Diffusion: movement of particles through a medium with transport proteins.
  • Osmosis: movement of water molecules through a selectively permeable membrane from high to low concentration.

Factors Affecting Diffusion

  • Concentration Gradient: difference in concentration between two areas, driving diffusion.
  • Temperature: increases kinetic energy of particles, increasing diffusion rate.
  • Surface Area: increased surface area provides more opportunities for particles to interact and diffuse.
  • Particle Size: smaller particles diffuse faster due to increased kinetic energy and smaller size.

Importance of Diffusion

  • Cellular Functions: diffusion maintains cellular homeostasis, regulates pH, and transports nutrients and waste.
  • Biological Systems: diffusion is essential for functioning of organs, tissues, and entire organisms.

Examples of Diffusion

  • Gas Exchange: diffusion of oxygen and carbon dioxide in the lungs.
  • Nutrient Uptake: diffusion of nutrients into cells.
  • Waste Removal: diffusion of waste products out of cells.

Understand the concept of diffusion, its types, and osmosis in biology. Learn about simple diffusion, facilitated diffusion, and osmosis.

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