Respiratory system

Nose | Air enters and leaves the respiratory system through the nose. It warms and moistens the air before it reaches the lungs, and helps remove unwanted particles, like dust and soot. | Trachea | The trachea is also known as the windpipe. It is a bony tube, which connects the nose and mouth to the lungs, hence is an important part of the respiratory system in vertebrates | Lungs | The lungs take in oxygen, which the body's cells need to live and carry out their normal functions. The lungs also get rid of carbon dioxide, a waste product of the cells. |

Nervous system

Brain | The brain is like a central computer that control bodily functions. It is protected by the skull to reduce damage. It is divided into many parts, including the cerebrum and brain stem. It stores and sorts out information before sending out any necessary commands. It is the centre of control and its job would be incomplete without the spinal cord. | Nerves | Each nerve is connected to a particular area and is responsible for connection to and from different regions of the body. ‘Multiple sclerosis’ is a problem which can damage nerves and prevent signals to travel from them. | Spinal cord | The spinal cord is a long bundle of nerve tissues. It is protected by the vertebrae so it doesn’t get damaged. There is also fluid that helps protect nerve tissue, keeping it healthy by removing waste products. The brains job would not be possible without the spinal cord. | Sense organsi.e. eyes, ears | Eyes – there are two different sights; long and short. With long sight, you can see distant objects clearly but object that are near are out of focus. Whereas, short distance is the opposite. Ears – the ear has two functions: * Hearing: detection of vibrations, their frequency and amplitude * Balance: detection of direction of motion, acceleration, related to