S1 The Body

2. A living thing.
3. Tubes which carry air from the trachea into the lungs.
8. Blood vessels which carry blood away from the heart.
9. A group of tissues that perform a specific function.
10. The basic unit of which all living organisms are made.
11. Green structure in a plant cell where photosynthesis takes place.
12. A layer made of cellulose which surrounds all plant cells to support them.
13. A group of cells in an organism which all have a similar structure and function.
16. An instrument used to magnify and look at tiny things closely.
17. The fluid that fills the cell.
18. A basic cell which has changed in order to carry out a particular job

1. Sheet of muscle which is involved in breathing movements.
4. The part of a cell that controls all its activities.
5. Body system which controls gas exchange.
6. Carries air from the mouth to the bronchi.
7. Store of water with dissolved sugar and salts which helps to support plant cells.
12. A thin layer which surrounds every cell and controls the movement of substances into and out of the cell.
14. A group of organs working together to carry out a particular task.
15. Small structures in the lungs where gas exchange takes place.