El Cuerpo Humano

An introduction to the human body describes the muscles and skeleton, the respiratory system, the brain and nervous system, the digestive system and how nutrition and exercise build a healthy body, the circulatory system, and the five senses, and explains how system each works.An introduction to the human body describes the muscles and skeleton, the respiratory system, the brain and nervous system, the digestive system, the circulatory system, and the five senses, and explains how system each works.