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FUNCTIONS The skeletal system has five very important jobs: 1.- Support, 2.- protection (the bones also protect many organs, and also the brain. Our skull protects the brain and our ribs protect our internal organs), 3.- movement, 4.- storage, 5.- and production of blood cells. Just think, if we did not have a skeletal system we would be just like a blob of Jell-O .
COMPONENTS OF THE SKELETON SYSTEM 1.- Bones and cartilage 2.- Joints 3.- Muscle system
There is a cartilage at the end of long bones, in the ears, the nose, the ribs, etc..
JOINTS knee or elbow. like a hip or shoulder Some turn from side to side, like a neck or wrist. The place where two bones join is called a join. There are two types of joints: 1.- Fixed joints do not let the bones move. Pe: the skull 2.- Movable joints let the bones move: HINGE JOINTS One direction BALL AND SOCKET JOINTS All directions and allow the greatest freedom of movement. knee or elbow. like a hip or shoulder Some turn from side to side, like a neck or wrist. Joints let us move the parts of the body. If all the bones were attached to each other, the skeleton would be rigid.
The place where bones are connected is called a joint. Joints give you the freedom to move your body. A skeleton without joints would be like a statue.
There are several different types of joints in our body:
1.- Mobile joints:
The ball and socket joint (hip, shoulder) allows a great range of movement in all directions.
The pivot joint (neck) moves around in a back and forth motion. A globe rotating is a good example of this . The gliding joint (wrist, ankle) allows a great range of motion. This joint is connected by one bone sliding over another bone.
2.- Semi-mobile joints:
The hinge joint (knee, elbow, fingers) works like a door's hinge. It only allows movement only in one plane.
3.- Fixed joints (skull, pelvis) do not move at all. All of these joints are crucial to the proper functioning of the body.
Muscles move when the NERVOUS SYSTEM sends them an order to move.
TYPES OF MOVEMENT:
1.- Voluntary mouvements when we want to: walking, turning the pages of the scrapbook or chewing. The brain send orders to make the voluntary movement.
2.- Involuntary mouvements without realising it. The movements internal organs make to carry out their functions are involuntary movements. The orders of these can come from the brain or the spinal cord.
It is a special type of movement. It is an involuntary movement
They are very quick movements we make without thinking.
When you burnt your hand you avoid a more serious burn when you take your hand away quickly.
VOCABULARY PARTS OF THE BODY OBSERVATION LAB USEFUL VOCABULARY Lower leg ( drumstick ): tibia and fibula Upper leg (tigh): femur (above it, there are part of the hip and backbone) Skin (epithelial tissue) Dimples (goose bumps) feathers Fat /Meat/ Shiny lining (fascia) Bundles Tendons /Ligaments/cartilage Artery / Vein Hinge joint (knee) Hip socket/ Knee cap/ bursa/ Soft red marrow/blood cells