Just because you can contribute to a 401(k) plan doesn't mean you'll be allowed to contribute to an IRA. For a traditional IRA, you must be under 70 1/2 years old at the end of the year.For Roth IRAs, your modified adjusted gross income must fall below the annual income limits.hough you're allowed to contribute to a traditional IRA when you're contributing to a 401(k) plan, you can't deduct your contribution if your modified adjusted gross income is too high. The limits are based on your filing status and adjust annually for inflation.
The initial event of an action potential is the depolarization of the axon due to the inflow of sodium ions. Thus, the option c is correct.
During the Action Potential. When an impulse is sent out from a cell body, the sodium channels open and the positive sodium cells surge into the cell. Once the cell reaches a certain threshold, an action potential will fire, sending the electrical signal down the axon. Action potentials either happen or they don't; there is no such thing as a partial firing of a neuron. This principle is known as the all-or-none law.