Lungs contain large number of minute alveoli in which

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larynx, trachea and bronchi. Lungs contain large number of minute alveoli in which external respiration takes place. Surrounding the lungs and the heart is a thoracic cage containing long, curved bones called ribs. Below the lungs is a diaphragm which divides the trunk into an upper thorax and a lower abdomen. The ribs and the diaphragm play a major role in the breathing movements inspiration and expiration. Circulation system The function of rat’s circulation system: The general idea in having a circulatory system is as a transportation method to get needed materials to living cells, and then get waste material out. That's what a rat's blood and circulatory system do. The heart pumps, the vessels do the delivery work. We then attach lungs to do gas exchange in the blood (O2 in and CO2 out), a gastrointestinal tract to process food and get nutrients into the blood (dumping the waste out directly), and kidneys and a liver to get waste material out of the blood. That's it in a nutshell. / The function of a rat's circulatory system is to distribute blood round the rat's body. In so doing, nutrients are passed to the body cells. The body temperature and pH are also stabilized.
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