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.
Those companies, in turn, work out different deals with their various subcontractors, who offer their technicians whatâs left over; some contractors pay installers as little as 40 percent of each job, Benion says, while others offer up to 70 percent.