To help you understand your injury, I have also provided you an explanation on how each organ system, tissue and specialized cell contributes to your injury. Bone cells from the skeletal system of the body allowed you to support your arm to allow you to block the volleyball. The skeletal system helps to support the body. Bone cells are created from cartilage. A group of bone cells create bone tissue. There are two types of bone tissue: the compact bone and the spongy bone. Compact bone is the hard part of the bone. It is what allows the bone to be strong. The spongy bone allows the bone to be lightweight. Along the compact bone, there are structures shaped like bones which are also known as osteocytes. Osteocytes receive oxygen and nutrients from red blood cells coming from blood vessels. Red blood cells are one of the specialized cells in the cardiovascular system. The cardiovascular system contributes to your overall health by removing cellular waste, maintaining a regular body temperature and bringing oxygen, nutrients and hormones to cells. Muscle cells from the muscular system work with the bone cells from the skeletal system in order to produce voluntary movement such as blocking a volleyball. There are three types of muscle cells. Smooth muscle cells are located in the internal organs and blood vessels. Cardiac muscle makes the heart. Skeletal muscle cells are attached to the bones and allows voluntary movement, such as swinging your arms to prepare for the