The first laboratory practice in the Biology lab its been about the disection of a heart and lungs of a lamb. In this practice we have seen the auricles and ventricles of a heart, the main vessels such as the aorta artery and the cava vein. It was interesting to observe also the atrioventricular valves. About the lungs, we observed the trachea, bronchi, and pulmonar tissue. This practice included Units 4 and 5 of our text book. We had even the chance to touch all the organs!