a little bit of everything

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

a little bit of everything 

which compound isn't part of the air we breathe?

1. oxygen
2. nitrogen
3. carbon dioxide
4. helium

which gas isn't used in our body?

1. carbon dioxide
2. oxygen
3. nitrogen
4. water vapour

explain the meaning of diffusion in your own words

In diffusion a substance moves from ...

1. a high to a low concentration
2. a low to a high concentration

Which change would not speed up diffusion in an animal cell?

1. Make the membrane thinner
2. Move the blood supply closer to the cell
3. Make the cell rounder
4. Increase the concentration gradient

what is osmosis?

nephron

The kidney is packed with around a million structures called nephrons. These nephrons start in the cortex of the kidney and loop down into the medulla and back to the cortex.

The nephron regulates the level of water, and salts and removes urea from the blood.

Recap: diaphragmatic breathing

Combined breathing

off to work