When diving doubles you will need to use your wing/BCD to compensation. Typically you can't control your buoyancy only with a drysuit with steel doubles and stage bottles so you will need to use your wing to offset buoyancy.
The structure of the throat is designed to prevent food from entering the lungs. Photo Credit matthewennisphotography/iStock/Getty Images. When food enters the lungs instead of the esophagus, it affects breathing and can cause choking and other problems.
To prevent food from entering your windpipe, it has a small flap of skin at the entrance (epiglottis). When you eat, this flap closes over your trachea to prevent food from entering. Trachea is a common biological term for an airway through which respiratory air transport takes place in organisms.