1.2 gas exchange and respiration

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Gas exchange and respiration

what is air?

what happens during gas exchange?

what is diffusion?

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

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

what is air?

which gas isn't used in our body?

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

cellular respiration

glucose + oxygen => water vapour + carbon dioxide + energy

C6H12O6 + 6 O2 => 6 CO2 + 6 H2O + energy

Explain the percentages on page 13. Why do the change during in/exhaling

finish the sentence...
lime water is an indicator for.............

diffusion

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?

kidneys

excrete water, minerals and other waste products

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.

Respiratory system

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