Methylene chloride is used as a solvent in paint strippers, as a propellant in aerosols, in the manufacture of photographic film, and as a process solvent in the manufacturing of drugs. In the research laboratory it is commonly used for extractions. It is also used as a metal cleaning and finishing solvent.
Expert: JamesStone replied 5 years ago. The trachea is reinforced with cartilage rings in order to keep the airway open. These rings reinforce the anterior and lateral sides, but are actually C shaped as opposed to complete rings which allows the trachea to constrict somewhat when swallowing food. As regards XXXXX XXXXX anatomical reason why most men have deeper voices than boys or women, it relates largely to the size of the larynx.
In humans there are about 15 - 20 incomplete C-shaped cartilaginous rings which reinforces the anterior and lateral sides of the trachea to protect and maintain the airway open.he C-shaped cartilage rings surrounding the trachea act as a support system, and allow the trachea to remain opened and prevent collapse with normal body movements.