A microorganism is an organism that can only be seen using a microscope.

A pathogen is a microorganism that causes disease.

An enzyme is a biological catalyst that speeds up the rate of reaction such as digestion.

Competition occurs between living organisms, e.g. bacteria competes for food and space to live.

Bacteria in the human digestive system

Science

Pupils will learn how cells use sugar from digested food as a source of energy.

Pupils learned that particles of substances move within, into and out of cells by diffusion.

**Andeep:** "Bacteria can be used to make some foods."

**Laura:** "Bacteria help break down food in our gut."

**Izzy:** "Bacteria should only be found outside the body."

**Sam:** "Bacteria are always harmful to human health."

"Gut flora" means the {{}} in our digestive system.

Bacteria produce {{}} that digest food we can't digest ourselves.

Which of the following do bacteria compete for?

Which of the following will help us maintain a healthy gut flora?

The smallest **living** part of an organism (such as plant, animal or bacteria) is called a...

Which of the following are found in a bacteria cell?

After we have swallowed food it moves through the oesophagus and then moves into the...

In which of these parts of the digestive system does most digestion take place?

Match the food type to the nutrients it is broken down into.

Enzymes {{}} the rate of a chemical reaction, such as digestion.