Bones are parts of the human or animalskeleton of vertebrates. They are stiff organs which make up the endoskeleton. Our body is made of flesh and blood built on a framework of bones. Without our bones, we could not stand up or move about. They also protect organs inside our body. The skull protects the brain and the ribs protect the heart and lungs. The jaw and cheekbones support the facial muscles, which help us smile. The number of bones in a human's neck is the same as a giraffe's.