The heart has four main chambers: the right atrium, right ventricle, left atrium, and left ventricle. The heart's valves ensure blood flows in the correct direction and include the tricuspid, ...

Steve Nix is a member of the Society of American Foresters and a former forest resources analyst for the state of Alabama. Leaves are the food factories of the tree. Powered by sunlight, the green ...

Neurons, also known as nerve cells, send and receive signals throughout your nervous system. While neurons have a lot in common with other types of cells, they’re structurally and functionally unique.

The brain is the “control center” of the body. Together with the spinal cord, it makes up the central nervous system. Various parts of the brain are responsible for movement, breathing, and other ...

Jim Cain, a semireformed chain-smoking 80-year-old from Perry, Okla., with a wispy gray ponytail and a shy smile, didn’t set out to become a plumbing supply store legend. But then again, who even knew ...

Female anatomy includes the internal and external structures, including those responsible for hormones, reproduction, and sexual activity. The female reproductive system is essential for hormone ...

Your eye is a slightly asymmetrical globe, about an inch in diameter. The front part (what you see in the mirror) includes: Just behind the iris and pupil lies the lens, which helps focus light on the ...

Chauncey grew up on a farm in rural northern California. At 18 he ran away and saw the world with a backpack and a credit card, discovering that the true value of any point or mile is the experience ...

When people talk about the vagina, they're probably referring to the vulva, which the Cleveland Clinic confirms is the umbrella name given to the female (or assigned female at birth's) external ...