Day and night, the muscles of your heart contract and relax to pump blood throughout your body. In the Step Thru below, see the complicated path the blood takes as it moves in and out of the heart. Do ...

Senior Lecturer and Clinical Academic in Faculty of Medicine, Health & Life Sciences, Swansea University Mammals, from the mighty blue whale to the tiny shrew, inhabit nearly every corner of our ...

Researchers grew a piece of a human heart in a lab. The new model isn't an entire heart. Instead, it's a model of the ventricle, one of the heart's major parts. The researchers say they reverse ...

Leonardo Da Vinci was one of the first people to draw detailed sketches of human anatomy. His drawings showed that he noticed networks of muscle fibers on the inside of the heart. Da Vinci thought ...

An organ is a group of tissues that work together to perform a specific task in the body, such as digesting nutrients or producing chemical messengers that enable brain cells to communicate. Although ...