Cell Organisation

Differentiation

The process by which cells become specialised for a particular job

When does differentiation occur?

During the development of a multicellular organism

What forms tissues?

Groups of similar cells that work together to carry out a particular function

Examples of tissues in mammals

• Muscular tissue which contracts to move whatever it's attached to

• Glandular tissue which makes and secretes chemicals (enzymes and hormones)

• Epithelial tissue which covers some parts of the body, e.g. the inside of the gut

What forms organs?

Groups of different tissues that work together to perform a certain function.

What forms organ systems?

A group of organs working together to for a particular function

What organs are the digestive system made up of?

1) Glands - produce digestive juices

2) Stomach and small intestine - digest food

3) Liver - produces bile

4) Small intestine - absorbs soluble food molecules

5) Large intestine - absorbs water from undigested foods

What do large multicellular organisms have?

Different systems inside them for exchanging and transporting materials