Upon contraction, the smallest motor unit, that is, the one associated with the fewest muscle fibers, is the normally the first activated. As the contraction progresses, larger motor units are brought into play.Efficient muscle contraction depends on the motor units within a muscle working effectively together.pon contraction, the smallest motor unit, that is, the one associated with the fewest muscle fibers, is the normally the first activated. As the contraction progresses, larger motor units are brought into play.
Trojan programs are most dangerous because they can create a back door. into your computer that gives malicious hackers direct access to your. system. Once installed, Trojans can hijack your PC and upload usernames, passwords, credit card numbers, social security numbers, and bank account.
Remove this template when most of the Wikipedia content has been removed or the Wikipedia information is outnumbered by non-Wikipedia information. Backdoor.Win32.IRCBot is a backdoor computer worm that spreads through MSN Messenger and Windows Live Messenger. Once installed on a PC the worm copies itself into a Windows system folder, creates a new file displayed as Windows Genuine Advantage Validation Notification and becomes part of the computer's automatic startup.