Voltage-gated ion channels are responsible for generation of electrical signals in cell membranes. Their principal subunits are members of a gene family and can function as voltage-gated ion channels by themselves. They are expressed in association with one or more auxiliary subunits which increase functional
3. Pass the medical exam. To be a firefighter, you will need to have coordination, agility, and strength, as well as an overall high level of physical fitness. You must also be in general good health and be free of any physical constraints.
Requirements for becoming a volunteer firefighter vary by fire department. Most departments require firefighters to be 18 years of age or older and hold a high school diploma or the equivalent. Candidates are generally required to pass written and physical exams, drug screenings and background checks.