molecular energy level. (physical chemistry). One of the states of motion of nuclei and electrons in a molecule, having a definite energy, which is allowed by quantum mechanics.1  Facebook.olecular energy level. (physical chemistry). One of the states of motion of nuclei and electrons in a molecule, having a definite energy, which is allowed by quantum mechanics. 1  Facebook.
Air first enters your body through your nose or mouth, which wets and warms the air. (Cold, dry air can irritate your lungs.) The air then travels through your voice box and down your windpipe. The windpipe splits into two bronchial tubes that enter your lungs.
Making the world better, one answer at a time. The lungs are moist so the alveoli do not dry up and so the lungs can still function properly. The air you breath helps to keep you lungs moist. :).n order for gas exchange to occur in the alveoli there must remain a constant supply of hemoglobin. Oxygen binds to hemoglobin and if these surfaces were dry then there would â¦ n't be any hemoglobin.