Human Body System

2. The first heart sound, or S1
4. Push air in and out of your body to breathe.
8. When cells exchange nutrients and waste with other cells through their membrane using a process called this.
9. Is the largest organ in the body
10. After air is sucked in through the nose and mouth, it travels down this.
12. The motion of breathing in oxygen.
14. Genes are made up of this.
15. The second heart sound, or S2

1. Where you put food to chew it and break it down using saliva and enzymes.
3. The body uses this to carry proteins, cells, and glands.
5. Food travels here where enzymes and juices break down your food into smaller bits.
6. Makes up your skin.
7. It takes 200,000 frowns to produce one of these.
11. Removes water from broken down food particles and pushes the rest out of the body as feces.
13. The centre of the cell, which acts as it's brain.