Period+2+Skeletal+Script

S: Hi I'm Seffie A: And I'm Alex S: We are here as the experts on the Skeletal System. A: The skeletal system is a very important part of your body, it is what holds you together! S: The skeletal system also has five major functions. The first function is that the skeletal system allows you to move. A: The next function is it protects your organs. S: The next function is it makes red blood cells. A: It gives your body shape and support. S: It also stores minerals and other substances until your body needs them. A: The body is made up of 206 bones for an adult. S: There are cells that build up the bone called Osteoblasts. A: There are also cells that break down the bone called Osteoclasts. S: Most of the bones have all the same construction. A: On the outside of the bone is a thin flap of tissue called the periosteum. S: Next Is a thick layer of compact bone. A: The compact bone is made up of small circular structures called lamellae. S: As we move deeper into the bone we reach the medullary cavity A: The medullary cavity is usally filled with yellow bone marrow that stores fat. S: But at the ends of some bones there is red marrow which produces blood cells. A: Now we will begin our journey into the skeletal system. S: Today we are going to start at the top of the body, the cranium. A: The cranium is a very important part of your body becuase it protects the brain. S: If you take a hard fall on the ground your cranium is what protects you brain from permanent damage. A: At the bottom of the cranium there is a bone called the mandible, or the lower jaw bone. S: Above the mandible there is a bone called the maxilla, or the upper jaw bone. A: These bones allow you to chew and in between them there are two rows of teeth. S: The maxilla and mandible are attached to one another by a hinge joint. A: We have now reached the scapula. S: The scapula also called the shoulder blade. A: It is a ball and socket joint, it connects to the humerus. A: Now we move on to the spine. S: The spine is a very important part of your body. A: The spine holds and protect the spinal cord. S: The spinal cord is part of the nervous system. A: It is what directs your body to do things, like bending, and running, and many other everyday activities that we perform. S: If you were to hurt your spinal cord you would be paralyzed from where you got hit down. A: The spinal cord is made up of 26 vertebrae. These allow you to bend. Vertebrae are connected by gliding joints. S: Now we will be making our way to the rib cage. A: The ribs are a partially movable joint. A: The ribs and sternum protect one of the most important parts of your body, the heart. S: They protect the heart just like the cranium does to the brain. A: In the middle of the rib cage there is a bone called the sternum or the breastbone. S: As you get closer to the middle of the rib cage, there are bands of cartilage, as you can see on this diagram. A: The cartilage allows your chest to expand when you breath S: As we move down the body we reach the arms. A: The arms allow us to do many neccesary tasks. S: The upper part of the arm is made of a bone called the humerus. A: The reason that it is called the humerus is because there is a nerve near your elbow that, every time when you hit it, it will vibrate and make an odd tickle sensation. S: The humerus connecting to the scapula is a ball and socket joint. A: The scapula is a large flat bone in your back. S: As you move down the arm there are two bones called the ulna and the radius. A: These two are very easy to get mixed up, so always remember, that the ulna connects to the pinkie, and the radius connects to the thumb. S: The humerus connecting to the ulna is called a hinge joint. S: Now we have reached the hands. A: The hands have three major sets of bones that we are going to talk about. S: The carpals, the metacarpals, and the phalanges. A: At the top there are the bones called the carpals that make up your wrist. S: Below the carpals there are the metacarpals at the center of your hand. A; After that there are the phalanges or fingers. S: There are also many more smaller bones that are in your hands as you can see in this diagram. A: We have now made our way into the pelvic area. S: The pelvis has one main bone, the hip bones. A:The spine attaches to the middle of the pelvis all the way from the neck. S: Also the femur attaches to the bottom of the pelvis in a ball and socket joint. S: There are four main bones in the legs. A: There is the femur, which is the thighbone. S: The femur connecting to the tibia and fibula in a hinge joint. A: The patella which is the knee cap, the patella protects the knee joint. S: The tibia, also known as the shin bone, is below the knee cap. A: The smaller bone beside the tibia is the fibula A: Now we are at the bottom of the body, the feet. S: The bones of the feet are catagorized simlar to the hands. A: First the tarsals make up the ankle. S: The the metatarsals make up the center of the foot. A: Lastly the phalanges make up the toes. S: Well folks now that we have gotten down to the bottom of the body I guess this concludes our jouurney! A: Don't forget, your bones are your buddies! S: I'm Seffie A: And I'm Alex A&S: Your skeletal reporters signing off!
 * Period 2 Skeletal System Script**
 * Cranium**
 * The Scapula**
 * The Spine**
 * Rib Cage**
 * The Arms**
 * The Hands**
 * The Pelvis**
 * The Legs**
 * The Feet**
 * Ending**