<em>The modeling tool shows exactly how different body parts form. Doctors can use models, like the one in the video, along with ultrasound pictures of a developing baby, to determine whether the embryo is growing normally and is forming the proper body structures at the correct time. If not, the doctor could inform the parents of the problem before the baby is born. Doctors could then make a plan to treat the condition, if possible.</em>
Answer:Each muscle in the body is made up of cells called muscle fibers. Muscle fibers are long, thin cells that can do something that other cells cannot do—they are able to get shorter.
