Film title: What is excretion?

All living things produce waste that they have to get rid of.

If they don't, it builds up in their bodies and can become harmful.

The process of removing waste products is called excretion.

excretion

When we breathe in, oxygen flows to the lungs and into the blood.

At the same time, waste carbon dioxide flows from the blood into the lungs.

carbon dioxide

Carbon dioxide is a waste gas ... it's excreted when we breathe out.

carbon dioxide
excreted by breathing out

sweat

Sweating is a way of excreting water and salts through our skin.

Urine is produced in our body's kidneys.

Urine passes through tubes called ureters to the bladder...

urine

Before being excreted when we go to the toilet.

Faeces are mostly solid food waste excreted from the intestines because it can't be digested.

faeces
excreted from the intestines

Our intestines also produce another waste product.

Bacteria in our intestines that help digest our food produce waste gases...

gas

Up to half a litre a day.

To avoid serious stomach pain these gases need to be excreted...

Sometimes with embarrassing noises!

carbon dioxide
sweat
urine
faeces

All living things need to excrete, but what do we mean by this?

Learning points

• Excretion is the process of removing waste products.
• Waste products need to be removed from the body, otherwise they can build up and become harmful.

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