What is the purpose and structure of the skeleton? 1. Supports and protects the softer parts of the body (the very important organs! )P
The brain is protected by the skull. The heart and lungs are protected by a strong rib cage. It is also protected by the breast bone (sternum) at the front and vertebral spinal column at the back. The spinal cord is protected by the vertebrae (bones of the spine). The intestines and reproductive organs are protected by the pelvis. 2. Supports our body through a framework of bones. Bones are not solid. The hard outer layer of the bone protects the light, porous (not solid) bone inside. This porous bone contains the marrow, which is the factory where red blood cells are produced a process called haematopoiesis. Red blood cells carry oxygen around the body, providing energy for our muscles. However, before we are born, all of our bones begin as a rubbery material called cartilage. As we grow, more and more deposits of calcium are laid down which change some of the cartilage into a more solid and rigid mass bone. act as an anchor for muscles which together, along with other soft tissues, make the body move. contain calcium and other minerals which make them hard (rigid) and provide strength. supply the body with calcium when the diet is calcium deficient. 3. Prevents the body from losing its shape. P 4. Suspends some of the vital organs, preventing them from crushing each other. 5.
Helps keep the calcium levels in the blood constant. Calcium is essential for the functioning of all the cells in the body, in particular the bones, brain and muscles. Without enough calcium, these cells do not operate properly. The body needs a constant level of calcium. If there is not enough calcium in the blood then cells called osteoclasts dissolve calcium from the bones. The appendicular skeleton refers to your arms and legs. It is called appendicular, from append because they are attached by girdles, which bridge each with the main body. How do our bones move? Bones cannot move without muscles. Most muscles (like those in our arms and legs) work in pairs one muscle contracts as the other one relaxes. The bone is pulled towards the contracted muscle. Muscles are attached to bone by tendons. How are bones joined together? The place where two or more bones meet is called a joint. P Some joints are fixed as in the skull, but others can move such as where the bones in the leg meet. (See Joints. )P At these joints, ligaments hold the bones together. Can bones bend? Bones in the body do not bend but break when abnormal pressure is placed on them. There is an exception to this and that is in a small child, called a greenstick fracture because it looks like a green rather than dry stick has tried to be broken. The skeletal system is made up of bones and teeth.
The normal human body has 206 bones which are needed for a variety of functions within the body. Bones are not static, which means they are constantly changing shape and composition to meet the body\’s needs. The role of bones extends beyond the function of giving your body its shape. There are many reasons why bones are important to the body. One of the most important functions that bones have in our body is providing support and structure. Aside from teeth, bones are the hardest and most rigid structures in our body. According to the National Naval Medical Center, without bones the human body would essentially be nothing more than a shapeless blob of tissue. Bones are strong but light, which gives the body support and shape without weighing it down. According to Minnesota State\’s Emuseum, the skeletal system also plays an important role in the protection of the vital organs throughout the body. This protective role is perhaps most obvious for the skull and the backbone (vertebrae) as these bones protect the central nervous system. This protective role is especially important because the central nervous system controls the rest of our body and is very fragile. The ribs also protect the vital organs in the chest, such as the lungs and heart. The skeletal system also closely interacts with the muscle system in our bodies, to the point where sometimes the two systems are thought of as one entityвthe musculoskeletal system.
Although not all of our muscles need to be attached to bones in order to move (because we have muscles in our digestive and cardiovascular system that help these systems function), the muscles that we use for voluntary movement all require bones to work properly. Muscles are attached to bones by bands of tissue called tendons. Bones are necessary because the muscles need something to attach to in order to contract and cause motion. According to the University of Michigan Comprehensive Cancer Center, the bones also are important as a center for the production of blood cells. The inside of bones is filled with a jelly-like material called bone marrow, which is where red blood cells (needed to transport oxygen throughout the body) are made. It is also where white blood cells (needed for the immune system), adipocytes (fat cells) and fibroblasts (needed to make connective tissue) are made. Colorado State\’s Pathophysiology Department says that bones also are responsible for the regulation of calcium levels. Calcium levels in the blood have to be kept in a narrow range to make sure that nerves and muscles are able to properly work. Much of the body\’s calcium is stored in bones. When the body needs more calcium, bone tissue can be broken down to increase the blood\’s supply. Excess calcium can also be stored in bone tissue for later use.