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.
Answer Wiki. Saltatory Conduction. As in un-myelinated axons, the first action potential in myelinated axons takes place at the initial segment of an axon and is generated by a threshold stimulus from the dendrites and cell body. Subsequent action potentials occur at the nodes of Ranvier, where the Na+ voltage-gated channels are located. Therefore, when nerve impulses travel down a myelinated axon, they appear to jump from node to node - in a process called saltatory conduction. Each nodal action potential is triggered by a threshold stimulus created by passive current from the previous node.