New News Biology #7

Active Transport

Active Transport:

• Process of using energy to absorb molecules

• Energy provided through cellular respiration

• Mirrors diffusion but not completely the same

Examples of Active Transport:

Root Hair Cells

these cells are found in the roots of plants

Has a bit sticking out for a larger surface area

Lots of mitochondria for cellular respiration

Absorbing of nutrients in the intestine

Lots of mitochondria

Uses active transport to absorb the nutrients

Has sticking out bits known as microvilli, which serves the purpose of creating a larger surface area.

Conclusion: Active transport is used when the diffusion gradient has been lowered to the point that no more diffusion can be conducted.

For example, when the concentration of a particular substance is higher inside than outside the cell, and more of that substance is required within the cell, active transport is used.