Biology 1c - Diffusion, osmosis and active transport 💧

Give me the definition of diffusion 💨

The movemet of particles from an area of high concentration to an area of low concentration

give me the definition of active transport 🌬

The movement of particles from an area of low concentration to an area of high concentration, NEEDS ENERGY

Give me the definition of osmosis 💧

The movemt of water from a low concentration of water to a high concentration of water across a partially permeable membrane

Give me 3 ways you can increase the rate of diffusion 💨

• Increasing the temperature

• increase the difference in concentration (concentration gradient)

• increase the surface area

what does dilute mean 💦

A high concentration of water, low concentration of something else (eg juice)

What does concentrated mean 🧃

Low concentration of water, high concentration of something else

How do you calculate percentage change ➗

(Change / original ) x 100

What is an exchange surface? 💨

An organ that is specialised to carry out diffusion

Why is Alvioli a good exchange surface (4) 🫁

• A good blood supply } SHORT DIFFUSION PATHWAY

• Thin walls } SHORT DIFFUSION PATHWAY

• a large surface area } SHORT DIFFUSION PATHWAY

• Well ventilated + a steep concentration gradient

Why is Villi a good exchange surface? (3) 🪢

• a good blood supply } SHORT DIFFUSION PATHWAY

• thin walls } SHORT DIFFUSION PATHWAY

• Large surface area

Why are root hair cells in plants a good exchange surface (3) 🌿

• Large surgace area } SHORT DIFFUSION PATHWAY

• Thin walls } SHORT DIFFUSION PATHWAY

• Steep concentration gradient which allows water and minerals to diffuse in

whst is:

• Independant variable

• dependant variable

• control variable

• Things you change

• things you measure

• things that stay the same