Heart
hideThe heart is a muscular organ in all vertebrates responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods. The term cardiac (as in cardiology) means "related to the heart" and comes from the Greek καρδιά, kardia, for "heart."
The heart of a vertebrate is composed of cardiac muscle, an involuntary striated muscle tissue which is found only within this organ. The average human heart, beating at 72 beats per minute, will beat approximately 2.5 billion times during a lifetime (about 66 years). It weighs on average 250 g to 300 g in females and 300 g to 350 g in males.
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News tagged with heart
Painkiller undermines aspirin's anti-clotting action
10 hours ago |
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Millions of Americans take Celebrex for arthritis or other pain. Many, if they are middle-aged or older, also take a low-dose aspirin tablet daily to reduce the risk of heart attack and stroke. Yet they may be getting little ...
Strict blood sugar control in some diabetics does not lower heart attack, stroke risk
12 hours ago |
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(PhysOrg.com) -- Strictly controlling blood glucose levels in type 2 diabetics with coexisting health problems such as heart disease and hypertension does not lower their risk of a heart attack or stroke, according to a UC ...
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Antidepressants may increase risk of stroke and death
Medicine & Health / Medications
13 hours ago |
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Postmenopausal women who take antidepressants face a small but statistically significant increased risk for stroke and death compared with those who do not take the drugs. The new findings are from the federally-funded, multi-institution, ...
Scientists suggest certain genes boost chances for distributing variety of traits, drive evolution
16 hours ago |
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Genes that don't themselves directly affect the inherited characteristics of an organism but leave them increasingly open to variation may be a significant driving force of evolution, say two Johns Hopkins scientists.
Minimally invasive surgery removes sinus tumor without facial disfiguration
19 hours ago |
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Only about one in 2,000 people in the United States get a sinus tumor, but Johnnie Wilcox was one of the unfortunate few.
Study unveils potential genetic links to lung disease risk
20 hours ago |
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A new study involving data from more than 20,000 individuals has uncovered several DNA sequences linked to impaired pulmonary function. The research, an analysis that combined the results of several smaller studies, provides ...
Gas improves blood flow and organ status during minimally invasive surgery
Dec 14, 2009 |
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As good as laparoscopy is in preventing some of the stresses of open surgery on the body, it does have drawbacks, including reduced blood flow and organ dysfunction. Laparoscopy is a type of surgery in the abdomen done through ...
26 operations, 13 kidneys: hope to few with little
Dec 14, 2009 |
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(AP) -- Twenty-six operations put healthy kidneys into 13 desperately ill people: Doctors in the nation's capital just performed a record-setting kidney swap, part of a pioneering effort to expand transplants ...
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