Observation is the active acquisition of information from a primary source. In living beings, observation employs the senses. In science, observation can also involve the recording of data via the use of instruments. The term may also refer to any data collected during the scientific activity.
About the Heart / Lung; Heart / Lung Center Data Profile; The aorta is the main artery that carries blood from the heart to all parts of the body except the lungs. The pulmonary artery is one of the two arteries that carry blood from the heart to the lungs. The vena cava is either of two large veins that return blood to the right atrium of the heart. The left atrium is the upper left chamber of the heart that receives blood from the pulmonary veins. The right atrium is the upper right chamber of the heart that receives blood from another part of the body and pumps it into a ventricle.
Blood enters the right atrium, the chamber on the upper right side of the heart. When the blood enters the right atrium, most of it flows through the foramen ovale into the left atrium. Blood then passes into the left ventricle (lower chamber of the heart) and then to the aorta (the large artery coming from the heart).