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.
Get the basic requirements. Firefighters must have a high school diploma and hold a valid driverâs license. Though firefighters must be 18 years old in order to work, limited on-the-job training can begin at a younger age. There may be a limit on age as well, usually between 28 and 30 years old.