Skeletal System.

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Presentation transcript:

Skeletal System

AIM ALL- identify the main bones in the body MOST- explain functions of the skeletal system SOME – analyse the bones involved in various sporting actions

Functions of the skeleton The skeleton performs many functions in the body. 1 Shape – The skeleton gives us our shape and determines our size. 2 Support – The skeleton supports muscles and organs. 3 Protection – The skeleton protects delicate parts of the body like the brain and lungs. 4 Movement – The skeleton allows us to move. Muscles are attached to the bones and move them as levers. 5 Blood cell production – blood cells are made in the bone marrow.

Shape and size Your skeleton affects your body shape and size. Bones play an important part in determining your height and build. People with long, light bones are usually tall and thin, whilst people with short, thick bones are likely to be short and more heavily built. Some sports are more suited to people of a particular size or body shape. This means that your skeleton and bone size can affect your performance in different sports. For example, weightlifting favours individuals with strong, heavy bones. Link this to work on somatotypes.

Shape and size

Support The skeleton acts as a framework. It gives the body support, enabling us to stand and walk upright. The bones of the back and chest support internal organs and help to keep them in place. The bones of the body are held together by ligaments. The skeleton provides a framework for the muscles, which are attached to bones by tendons. Can you imagine what humans would look like if they didn’t have bones to support them?

Movement Bones work with muscles to produce movement. Muscles are attached to bones by tendons. Bones have surfaces that allow for strong attachment. Tendons fuse with the tough Periosteum membrane on the outside of the bone. Muscle Tendon Periosteum Bone

Movement

Protection Some of our body parts, such as the brain, are very delicate and need protection from external forces. Bones can protect body parts from impacts and injuries. The cranium protects the brain. It encloses the brain entirely in a shell of bone. The rib cage protects the delicate organs of the chest. cranium Answers: The rib cage needs to be flexible enough to allow the movements necessary for breathing. A solid bone rib cage would be extremely heavy, making movement more difficult. Could also point out that the organs of the chest are not quite as delicate as the brain, so solid bone protection is less necessary. Can you think of two reasons why the rib cage has gaps in it rather than being a solid shell of bone?

Blood cell production Red marrow embedded in spongy bone Red and white blood cells and platelets are made in the bones. The ends of long bones and some other bones including the ribs, humerus, femur and even vertebrae bones, contain red bone marrow. This is where the blood cells are produced. The shaft of long bones is filled with yellow bone marrow which does not produce blood cells. Yellow bone marrow in the shaft

Naming bones Cranium (skull) Clavicle (collar bone) Sternum (breast bone) Ribs Humerus Pelvis Radius Ulna Patella (knee cap) Encourage students to learn both the common name and scientific name of each bone. Femur Tibia Fibula

Label these bones on the Main bones in the body Clavicle Radius Ulna Patella Humerus Tibia Fibula Pelvis Femur Rib cage Label these bones on the skeleton diagram

Plenary Exam Questions on the skeletal system Functions Location of bones Can use homework book