Digestive System

Question 1

Stages of nutrition

Answer 1

Ingestion/eating food is taken in by the body

Digestion food is broken down

Absorption: digested food passes through the blood stream

Assimilation: using the food in the cells in the body

Question 2

Physical digestion

Answer 2

Taking large pieces of food and breaking them down into smaller pieces happens in the

Mouth: teeth

Question 3

Chemical digestion

Answer 3

Involves the use of chemicals called enzymes to break down food

Enzymes are chemicals that speed up reactions without being used up in the reaction

How enzymes work: enzymes act on a substrate and break it down into a product eg. Substrate,starch enzyme = amylase (saliva ) product = maltose (sugar)

Question 4

Chemical digestion 2

Answer 4

Amylase in mouth

Enzymes in the stomach

Most chemical digestion happens in the small intestine

Bile made in the liver breaks down fats

Pancreas makes digestive juices which contain enzyme’s