Bacteria in the human digestive system | Science | Quizalize & Oak National Academy

Starter quiz

The smallest living part of an organism (such as plant, animal or bacteria) is called a...
- nucleus
- molecule
- cell ✓
- tissue
- system
Which of the following are found in a bacteria cell?
- cytoplasm ✓
- cell membrane ✓
- mitochondria
- chloroplasts
- cell wall ✓
After we have swallowed food it moves through the oesophagus and then moves into the...
- 'stomach' ✓
In which of these parts of the digestive system does most digestion take place?
- stomach
- small intestine ✓
- large intestine
- rectum
- liver
Match the food type to the nutrients it is broken down into.
- carbohydrates
  
  ⇔
  
  sugars ✓
- lipids
  
  ⇔
  
  fatty acids and glycerol ✓
- proteins
  
  ⇔
  
  amino acids ✓
Enzymes ______ the rate of a chemical reaction, such as digestion.
- 'speed up' ✓

What are pathogens?
- Bacteria that cause disease. ✓
- All bacteria.
- Bacteria used to make food.
- Bacteria that produce enzymes.
Which people are correct?
- 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' ✓
Bacteria produce ______ that digest food we can't digest ourselves.
- 'enzymes' ✓
Which of the following do bacteria compete for?
- enzymes
- food ✓
- pathogens
- space ✓
Which of the following will help us maintain a healthy gut flora?
- Eating fermented foods. ✓
- Eating lots of protein.
- Eating fruit and vegetables. ✓
- Eating food with a high sugar content.

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Bacteria are living organisms; each bacterium is a microorganism made of a single living cell.
Some bacteria are pathogens that cause diseases, but many bacteria are harmless and some are helpful.
Helpful bacteria live inside the human digestive system.
They release enzymes that digest food we cannot digest ourselves.
They also help to protect us against pathogens that enter the digestive system by competing against them.

All bacteria are bad for us and make us unwell.

The lesson looks at how helpful bacteria in the gut help us digest our food, provide vitamins, and outcompete harmful bacteria.

Bacteria - Bacteria are unicellular organisms.
Microorganism - A microorganism is an organism that can only be seen using a microscope.
Pathogen - A pathogen is a microorganism that causes disease.
Enzyme - An enzyme is a biological catalyst that speeds up the rate of reaction such as digestion.
Competition - Competition occurs between living organisms, e.g. bacteria competes for food and space to live.