Human embryos are more muscle-bound than adult humans, new microscope images cataloging early development show. For instance, at seven weeks of gestation, embryonic hands have about 30 muscles. Adults ...
Run a finger down the center of the forearm, curl the fingers, and flex the wrist. For many people, a thin cord jumps into ...
The muscular system works to control the movement of our body and internal organs. Muscle tissue contains something called muscle fibers. Muscle fibers consist of a single muscle cell. They help to ...