The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is ...

A basic review of the anatomy, physiology and personal protective equipment related to the respiratory system.

Circulatory system: Blood vessels. Laid end-to-end, ... 2.5 million new red blood cells are released from the bone marrow, replacing a similar number that are destroyed or damaged.

Discover 7 shocking factors your immune system needs beyond food. Learn why diet alone isn't enough for optimal immune health ...

Following a heart transplant, patients must undergo surgical biopsies so that clinicians can monitor for signs of organ rejection. A new study shows the promise of a biomarker that could allow doctors ...

Researchers say a key compound in this drink could restore cells helping you live for longer and protecting you against ...

Period loss, or amenorrhea, affects approximately 3% to 4% of women of reproductive age. It can be the body’s response to an ...

Some parts of it were what you might call “visibly invisible”: Everyone in Tehran knows about Evin Prison, perched on the ...

Your backyard may be a place of peace, play, and plant life—but some of that greenery could be more dangerous than it looks.

Researchers at the Georgia Institute of Technology and India's National Center for Biological Sciences have found that yeast clusters, when grown beyond a certain size, spontaneously generate fluid ...

Pixar’s Elio created its alien beings not by gazing into telescopes, but by peering into microscopes.