Digestion is the process of breaking down food into substances that can be absorbed into the blood.

The digestive system is a collection of organs that break down food.

A gland is a tissue or an organ that produces chemicals.

An adaptation is a feature that helps an organism to function and survive.

Fibre bulks up food so it can be moved through the digestive system more easily.

The parts of the human digestive system

Science

Digestion and enzymes

Food tests: practical

Bacteria in the human digestive system

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

Digestion is the process of breaking down large food  molecules into smaller molecules that can be absorbed into the blood.

An enzyme is a biological molecule that is a catalyst that speeds up the rate of a reaction.

A carbohydrate is a molecule made of carbon, hydrogen and oxygen, and provides energy.

A protein is a molecule made of amino acids, and is used for growth and repair.

A fat is a molecule that is stored and used for energy.

A food test shows if a specific type of food is present in a sample.

A reagent is a chemical used to test for a type of food.

A qualitative test is one that gives an indication of presence, but not an exact figure.

A quantitative test is one that gives a measurable, numerical, value.

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.

Blood is a liquid which transports nutrients and waste  around the body.

Absorption is the process of moving nutrients from the digestive system into the blood.

Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration.

The circulatory system includes the heart and blood vessels through which blood can move.

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Human digestive system

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