Systole is the last stage of a heart beat. It happens right after diastole, when the heart refills with blood. During systole, the heart's two ventricles contract (squeeze). (The ventricles are the largest parts of the heart, which pump blood to the body and lungs.) During systole, the heart muscle gets an automatic electrical signal that tells the heart to contract (squeeze). This makes the blood flow out of the heart.
Basics. General contractors earned a mean $45.14 per hour, or $93,900 per year, as of May 2011, according to the Bureau of Labor Statistics. The lowest-paid 10 percent of contractors received less than $24.35 per hour, or $50,650 per year, while the best-paid 10 percent made $71.67 per hour, or $149,070 per year.
Industries. In 2011, nonresidential building construction provided almost a quarter of the 195,000 jobs for contractors, with average salaries at $45.41 per hour, or $94,450 per year.Building equipment contractors contained 14 percent of the positions at a mean $46.52 per hour, or $96,750 per year.epending on the size of the project, general contractors also can be called construction managers or project managers. Though they work from a main office, they often report to construction sites where they can monitor progress firsthand.