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The cardiovascular system is comprised of the heart and the network of arteries, veins, and capillaries that carries blood throughout the body. The average adult male has between 5-6 liters of blood while the average adult female has 4-5 liters. Blood transports oxygen and essential nutrients to all of the living cells in the body, and also carries waste products from the tissues to the systems of the body through which they are removed.
Updated: 1 hour 19 min ago

Why is blood red?

Fri, 06/30/2017 - 07:00
Ring-shaped chemical structures with metal irons produce color. The iron in our red blood cells makes them red, while magnesium makes plant leaves green.

Health insurance expansion via Obamacare linked to fewer cardiac arrests

Thu, 06/29/2017 - 07:00
A sudden catastrophic loss of heart function, or cardiac arrest, occurred significantly less among adults who acquired health insurance via the Affordable Care Act (ACA), according to new research in...

Hospitalizations for heart failure on the decline; disparities remain for blacks and men

Wed, 06/28/2017 - 07:00
The number of people hospitalized for heart failure in the United States declined about 30 percent between 2002 and 2013, but large disparities between blacks vs. whites and men vs.

Asthma history linked to risk factor for heart failure

Wed, 06/28/2017 - 07:00
People with a history of asthma may be at greater risk of left ventricular hypertrophy, the thickening of the heart's main blood-pumping chamber.

Mechanism shown to reverse disease in arteries

Wed, 06/28/2017 - 07:00
A certain immune reaction is the key, not to slowing atherosclerosis like cholesterol-lowering drugs do, but instead to reversing a disease that gradually blocks arteries to cause heart attacks and...

A-fib patients at lower stroke, death risk with early cardiology care

Tue, 06/27/2017 - 15:00
Receiving cardiology care within 90 days of atrial fibrillation diagnosis may lower patients' stroke and death risks by up to 11 percent, study finds.

Low-income childhood may affect adult heart health

Tue, 06/27/2017 - 14:00
New study links low income in childhood to increased left ventricular mass and diastolic dysfunction - both tied to cardiovascular disease - in adulthood.

Are current exercise guidelines too demanding?

Mon, 06/26/2017 - 15:00
Fitting in the recommended amount of exercise is a challenge in our busy lives. Are there health benefits associated with doing less exercise? We find out.

Greater emphasis on preventing, treating heart disease in women needed

Fri, 06/23/2017 - 07:00
Women and physicians do not put enough emphasis on cardiovascular disease in women, and a social stigma regarding body weight may be a primary barrier to these important discussions, according to...

What are hemoglobin levels?

Fri, 06/23/2017 - 07:00
What is hemoglobin, and what do high and low hemoglobin levels mean? Learn more about symptoms, treatment, and who is at risk from hemoglobin imbalances.

Humans retain genes for coronary artery disease because they make for more prolific parents

Thu, 06/22/2017 - 18:00
Genome-wide scans suggest that natural selection keeps these genes in the population as they benefit childbearing capacity.

Breast implants may cause false ECG diagnosis of heart attack

Thu, 06/22/2017 - 14:00
A new study suggests that ECG recordings, which are used to diagnose heart attack and other disorders, can be abnormal in patients with breast implants.

Could a cholesterol-lowering vaccine replace statins?

Tue, 06/20/2017 - 14:00
Researchers reveal the development of a vaccine that successfully reduced 'bad' cholesterol and atherosclerosis in mice. It is now being tested in humans.

Study casts doubt about link between eczema, cardiovascular disease

Tue, 06/20/2017 - 13:00
For the roughly 7 percent of adults who live with atopic dermatitis, a common form of eczema, a new study reports a little good news: Despite recent findings to the contrary, the skin condition is...

Heart failure: Stem cell therapy may worsen heart damage

Fri, 06/16/2017 - 15:00
For heart failure patients, research suggests that using cardiac stem cells for autologous stem cell therapy may exacerbate heart tissue damage.

New screening tool helps ID heart surgery patients at risk for malnutrition

Fri, 06/16/2017 - 07:00
Simple risk score guides surgeons in providing nutrition support sooner and more aggressively.

Sex-specific cardiovascular drug dosages needed to reduce adverse reactions in women

Fri, 06/16/2017 - 07:00
Sex-specific cardiovascular drug dosages are needed to reduce adverse reactions in women, according to a position paper from the European Society of Cardiology published in European Heart Journal ...

Can use of a drone improve response times for out-of-hospital cardiac arrests compared to an ambulance

Fri, 06/16/2017 - 07:00
In a study involving simulated out-of-hospital cardiac arrests, drones carrying an automated external defibrillator arrived in less time than emergency medical services, with a reduction in response...

Metabolic syndrome: An hour of resistance training per week may cut risk

Thu, 06/15/2017 - 14:00
New research reveals that under 1 hour per week of resistance exercise, independent of aerobic exercise, is tied to lower risk of metabolic syndrome.

Statins may raise the risk of Parkinson's disease

Thu, 06/15/2017 - 07:00
New research suggests that rather than protecting against Parkinson's disease, it is possible that the use of statins may increase its risk.