b.2.2 tisuses organs&organ systems.

cells of multicelllar organsims may differentiate&become adapte for specific functions.

animal organs:

large multielluar organisms develop systems for excanging materials.

during the development of a multicellular cells differentiate so that they can perform different functions.

group of cells with similar structure:

muscular tissues:

can contract to bring about movement.

can produce substances such as enzymes&hormones.

covers some parts of the body.

are made out of tissues. 

muscular:

to churn the contents

glandular tissues:

to produce digestive juices

epithelial tissues:

to cover the outside&the inside of the stomach.

groups of organs that perform a particular function eg disestive system.

glands:

such as the pancreas&salivary glands which produce digestive juices.

the stomach&small intestine where digestion occurs.

the liver which produces bile.

the small intestine where the absorption of soluble food occurs.

the large intestine, where water is absorbed from the undigested food producing faeces.