Meet Bone and Muscle without them we wouldn't be able to sit, stand, or walk! Readers will join colorful characters to learn about how their skeletal and muscular system supports them. Along the way they'll be introduced to bone marrow, osteoblasts, osteocytes, marrow, voluntary and involuntary muscles, and broken bones. They'll also learn how to keep their bones and muscles healthy and active. Quirky characters and a graphicnovel format help to hook readers and explain biological concepts. For more content on the wonders of the body, check out other titles in the Building Blocks of the Human Body series!