Some muscles (skeletal muscles) will not contract unless stimulated by neurons; other muscles (smooth & cardiac) will contract without nervous stimulation but their contraction can be influenced by the nervous system. Thus, the nervous and muscle systems are closely interconnected.
A Roth IRA is an individual retirement plan that is subject to rules that would apply to a traditional IRA, but with some exceptions [source: IRS ]. Contributions are not tax deductible and qualified distributions are tax free. Here are some of the things you must consider when setting up a Roth IRA account:1  The account must be designated as a Roth IRA when it's opened. 2  The account can be opened at any time. 3  Contributions can be made at any age.ontributions are not tax deductible and qualified distributions are tax free. Here are some of the things you must consider when setting up a Roth IRA account: 1  The account must be designated as a Roth IRA when it's opened. 2  The account can be opened at any time.
[1] There are no official minimum or maximum age limits on making contributions to a Roth IRA. This feature gives younger and older investors the opportunity to invest the money they've earned and accrue earnings at a tax free rate.inimum Age Limits. There is no minimum age limit on when an investor may begin making contributions to a Roth IRA. As long as the trustee or custodian that holds the account will allow a minor to open a Roth IRA, a child or teenager may make contributions from post tax income.