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.
If you ask any firefighter what it takes to create a fire, you will learn that you have to have three things: 1  A fuel - You need some sort of combustible solid, liquid or gas. 2  Oxygen to react with the fuel.  Heat - There must be enough heat to get the fuel above its flash point.