The Circulatory System

Sometimes blood can look blue through our skin. But this is an optical illusion.

A new evolutionary investigation finds that skinks likely evolved to have green blood a total of four different times throughout history.

Scientists have coaxed a minibrain into growing blood vessels and capillaries.

There are a lot of ways to die from a traumatic injury, but many of them come down to this: So much blood spills out that your body just stops working.

A chocolate milkshake may be bliss for your taste buds, but it's not so good for your blood vessels.

Researcher say they've found a network of fluid-filled spaces in tissue that hadn't been seen before.

Regularly eating meats that are sizzled on the grill may increase the risk of high blood pressure, a new study suggests.

Your eyes are the windows to your heart — and Google wants in.

Your genetic code: the ultimate murder witness.

People who experience migraines may be more likely to develop cardiovascular problems, a new study from Denmark finds.

It's really tricky to measure how much marijuana a person has used on a given day — and how impaired their driving may be as the result of that use — a new review says.

A rare find in amber connects ancient ticks to feathered dinosaur hosts.

Injecting the blood plasma of healthy young people into people with Alzheimer's disease might be safe, but not all experts are behind the idea.

Fans of Tesla electric cars who also have implanted heart devices can rest easy.

If your mother ever warned you to slow down because you eat too fast, she now has at least one good reason to support her case.

A weak heart may age parts of the brain by 15 to 20 years.