An average adult has 5 to 6 quarts (4.7 to 5.6 liters ... deoxygenated blood back to the heart. The system of blood vessels in the human body measure about 60,000 miles (96,560 kilometers).

For 150 years, 98.6 degrees Fahrenheit was thought to be the average body temperature for a healthy human being ... of microbes and help the immune system work faster. Because body temperature ...

When the thermometer came out of your mouth, it had to read higher than 98.6°F—the long-accepted “normal” human body ... a just-right body temperature, central nervous system sensors ...

From trouble sleeping to wimpy muscles, living on board the International Space Station really does a number on the human body. Get to know how your body could react to life in orbit with these 6 ...

Learn surprising and evidence-based corrections to commonly held beliefs about the human body. Trump-appointed official, who oversaw dismantling of USAID, leaves State Department Actors Who ...

An introduction to the amazing functions of the human body's nervous system. An introduction to the amazing functions of the human body's nervous system. This extremely advanced part of our ...

Learn all about the human body's many systems and some of its individual organs, both vital and vestigial. When you purchase through links on our site, we may earn an affiliate commission.

Various organ systems of the Human Body are Digestive System, Circulatory System, Endocrine system, Excretory System, Integumentary System, Nervous System, Respiratory System, Skeletal System and ...

How weird is that? To unravel the mysteries of the body we're going to group organs together by the jobs they perform, or their function. We call these organ systems or body systems. Organs are ...