<span>It is a vacuum effect. The lungs have gotten used to their size and shape, and they are comfortable this way. When a person forcibly exhales, it constricts the lungs. When a person relaxes, the lungs return to their normal shape as they took in air. The only ventilation is the trachea, and it forces air in.</span>
Answer:
to apply bold, select the area you want to apply it to, then hold down the control (ctrl) key and hit the B key, then to apply italics, hold down control (ctrl) and hit the I key
The answer is A - vitamin deficiency
<span>There are a wide range of degenerative diseases that can affect the nervous system. Dependent on the patient's age and hereditary history, the disorder could be any one of the following amongst others: Alzheimers Disease, Huntingdon Chorea, Parkinsons Disease, Multiple Sclerosis, ALS or Amyotrophic Lateral Sclerosis.</span>
