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 Thereâs no age limit for contributions to Roth IRAs. 2  For regular IRAs, you lose the ability to make contributions in the year you turn age 70Â½. 3  Not so for Roth IRAs. 4  If you meet the other requirements, you can set up a brand new Roth IRA at age 85 and begin saving for your âretirement.â Thereâs also no lower age limit.or some people the most important limit on contributions to a Roth IRA is based on modified adjusted gross income (âmodified AGI,â defined below). If this number is too large, your contribution limit may be reduced â possibly all the way to zero.