Name _________________. Overview. In this activity, you will study the effects of gravity on the planets of the Solar System. First, you need to view movies from the lunar Apollo missions, then calculate your weight on other planets. Finally, you will propose your weight on newly discovered planets around other stars.
A tracheostomy is an opening cut into the windpipe, or trachea. It is used as an airway for breathing. After the opening is made, a small tube is inserted to let air in, and to attach a breathing machine (mechanical ventilator) if needed.
Reasons for a tracheostomy. A tracheostomy is usually done for one of three reasons: to bypass an obstructed upper airway; to clean and remove secretions from the airway; to more easily, and usually more safely, deliver oxygen to the lungs.