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

The parts of the human digestive system

Digestion and enzymes

Food tests: practical

Absorption and transport of nutrients in humans

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.

This unit examines the human digestive system, including the roles of tissues, organs, enzymes, and beneficial bacteria. It also focuses on evaluating risks, interpreting data, identifying patterns, and suggesting improvements to enhance the reliability of investigations.

Human digestive system

**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.

Bacteria in the human digestive system

Lesson outcome