![]() ![]() They also help the body do such things as chewing food and then moving it through the digestive system.Įven when we sit perfectly still, muscles throughout the body are constantly moving. Muscles pull on the joints, allowing us to move. osteoclasts (AHS-tee-o-klasts), which break down bone and help to sculpt and shape it.osteocytes (AHS-tee-o-sites), mature bone cells which help continue new born formation.osteoblasts (AHS-tee-uh-blastz), which make new bone and help repair damage.Because girls mature at an earlier age than boys, their growth plates change into hard bone at an earlier age.īone-building continues throughout life, as a body constantly renews and reshapes the bones' living tissue. These growth plates are easy to spot on an X-ray. These plates consist of multiplying cartilage cells that grow in length, and then change into hard, mineralized bone. The bones of kids and young teens are smaller than those of adults and contain "growing zones" called growth plates. Cartilage (KAR-tul-ij), a flexible, rubbery substance in our joints, supports bones and protects them where they rub against each other. White blood cells help the body fight infection.īones are fastened to other bones by long, fibrous straps called ligaments (LIG-uh-mentz). Red blood cells carry oxygen to the body's tissues, and platelets help with blood clotting when someone has a cut or wound. The bone marrow contains stem cells, which produce the body's red blood cells and platelets, and some types of white blood cells. ![]() In this soft bone is where most of the body's blood cells are made. It is made up of a mesh-like network of tiny pieces of bone called trabeculae (truh-BEH-kyoo-lee). Cancellous (KAN-suh-lus) bone, which looks like a sponge, is inside compact bone.Holes and channels run through it, carrying blood vessels and nerves. It looks like ivory and is extremely strong. Compact bone is the solid, hard outside part of the bone.The amounts of some vitamins and minerals that you eat, especially vitamin D and calcium, directly affect how much calcium is stored in the bones.īones are made up of two types of bone tissues: Bones store calcium and release some into the bloodstream when it's needed by other parts of the body. The ribs form a cage that shelters the heart and lungs, and the pelvis helps protect the bladder, part of the intestines, and in women, the reproductive organs.īones are made up of a framework of a protein called collagen, with a mineral called calcium phosphate that makes the framework hard and strong. The spinal cord, a pathway for messages between the brain and the body, is protected by the backbone, or spinal column. The skull protects the brain and forms the shape of the face. Although they're very light, bones are strong enough to support our entire weight.īones also protect the body's organs. Bones provide support for our bodies and help form our shape. ![]()
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