(Bio) Organisation - The Digestive System

What is a tissue?

A group of cells with a similar structure and function.

What is an organ?

A group of tissues working together for a specific function.

What is an organ system?

A group of organs working together to perform a specific function

What are the 3 main nutrients in food?

Carbohydrates, Proteins and Lipids

Why do food molecules need to be digested?

They are too large to be absorbed into the bloodstream.

What happens during digestion?

Large food molecules are broken down into smaller molecules by enzymes.

What is the role of the mouth?

Food is chewed and enzymes in saliva begin to digest starch into simple sugars.

What is the role of the stomach?

Churns Food, Produces Hydrochloric acid and protease enzymes (to digest proteins)

Why does the stomach produce hydrochloric acid?

To help enzymes digest proteins.

What does the pancreas do?

Releases enzymes into the small intestine to continue digestion of starch

What does the liver do?

Produces bile which emulsifies lipids and neutralises stomach acid.

What happens in the small intestine?

Enzymes digest protein and lipids. Small food molecules are absorbed into the bloodstream by diffusion or active transport.

What happens in the large intestine?

Water is absorbed into the bloodstream.

What happens to the products of digestion?

Absorbed into the bloodstream and used for energy growth and repair.