Learn: Diffusion in Biology

Welcome!Today we'll explore diffusion, a key concept in biology. It's an essential process for transporting substances in and out of cells. Let's dive in!

What is Diffusion?Diffusion is the movement of particles from an area of high concentration to an area of low concentration. This happens because particles spread out to balance their distribution.

Why is Diffusion Important?Diffusion allows cells to absorb nutrients and oxygen, and to remove waste products like carbon dioxide. For example, oxygen diffuses into the bloodstream from the lungs.

Factors Affecting DiffusionThe rate of diffusion can be affected by temperature, concentration gradient, and surface area. Higher temperatures speed up particle movement, while steeper gradients and larger surface areas increase the rate of diffusion.

Diffusion in CellsIn cells, diffusion occurs across the cell membrane. Nutrients like glucose and oxygen enter cells via diffusion, while waste products like carbon dioxide leave the cell.

Real-World Example: Oxygen and Carbon DioxideIn the lungs, oxygen diffuses from the alveoli (tiny air sacs) into the blood because there is a higher concentration of oxygen in the alveoli compared to the blood. Carbon dioxide diffuses in the opposite direction.

Review Time!Great work! You've learned about diffusion, its importance, factors affecting it, and how it works in cells. Let's test your understanding with a few final questions.