lungs
A swim bladder is for a fish as lungs are for human. The fish takes in oxygen from the water using its gills. There are also some species especially those in slow-moving waters gulp air at the surface. An example is lung fish. The lung fish has a swim bladder richly supplied with blood vessels
Blood takes a very long trip inside the human body. The blood vessels accomplish this task of carrying blood to all the organs of the body from and back to the blood pumping station or the heart. The study of blood vessels is called angiology. The heart, the blood vessels and the blood together are
The lungs are among the most complex structures of the body. They form the important organ of the respiratory system. Though we expose them to smog, dust, industrial fumes, even cramp them with poor posture, they nevertheless carry on their task trouble-free. All that the lungs need to carry on respiration activity is hot,