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The Skeletal System~ GATE

Alyssa Mexicano & Kelsey Price 5th Grade

alyssa mexicano

on 18 September 2015

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Transcript of The Skeletal System~ GATE

The Skeletal System
Alyssa Mexicano & Kelsey Price
How Your Bones Work
- Your Skeletal System is all of the bones in the tissues such as tendons, ligaments, and cartilage that connect them.
- Your teeth are also considered part of your skeletal system. But they aren't counted as bones. Your teeth are made of enamel and dentin.
The Parts of the Skeletal system
- The skeletal system has two distinctive parts : the axial skeleton and the appendicular skeleton. The axial skeleton, with a total of 80 bones, consists of the vertebral column, the rib cage and the skull. The appendicular skeleton has a total of 126 bones, and is formed by the pectoral girdles, the upper limbs, the pelvic gridle, and the lower limbs.
The Fragile Bones
- Your skeleton also helps protect your internal organs and fragile body tissues. The brain, eyes, heart, lungs, and spinal cord are all protected by your skeleton. Your cranium (skull) protects your brain and eyes, the ribs protect your heart, and lungs and your vertebrae (spine/backbone) protect your spinal cord.
-Your skeleton also helps protect your internal organs and fragile body tissues. The brain, eyes, heart, lungs, and spinal cord are all protected by your skeleton. Your cranium (skull) protects your brain and eyes, the ribs protect your heart and lungs, and your vertebrae (spine/backbones) protect your spinal cord.
-Bones provide the structure for muscles to attach so that our bodies are able to move. Tendons are tough inelastic bands that attach muscle to bone.
-The skull is composed of 22 bones that are fused together except for the mandible. These 21 fused bones are separate in children to allow the skull and brain to grow, but fuse to give added strength and protection as an adult. The mandible remains as a movable jaw bone and forms the only movable joint in the skull with the temporal bone.
-Where the bones come together at joints there is a cushion of cartilage that helps protect the bones. Cartilage helps to prevent the bones from rubbing against each other and wearing down the bone. Between the joints in your spine the vertebrae are protected by cushion-y discs of cartilage. Your nose and ears are also made of cartilage. Try bending your ears and nose but don`t get carried away!
Who has more bones?
-Babies have more bones than adults! At birth, you have 300 bones. As you grow older, small bones join together to make big bones. Adults end up with about 206 bones.
-An articulation, or joint, is where two bones come together. In terms of the amount of movement they allow, there are three types of joints; immovable, slightly movable, and freely movable.
-Bones have an outer layer of compact bone, one of the bodies hardest materials. On the inside is an area that may contain yellow bone marrow (a fatty tissue).
Bone Structure
Compact Bone
-Compact bone consists of units called osteons, each about 1 mm (1/25 in) across. It is made up of numerous tiny rings of a hard tissue arranged around a central canal, through which blood vessels and nerves pass.
-Joints are the parts of the body where bones meet. Some, such as the joints in the cranium, allow no movement between the joints in the bones. Others, such as the spine,
allow limited movement. A few,
such as the hip joints, permit a wide range of movement. The bones of many joints are held in place by muscles and bands of tissue called ligaments.
Classification of bones
-Bones are divided into four basic types or classifications. Bone classification is based primarily on the shape of the bone. Long bones are longer than they are wide and are primarily found in the appendages.
Are Bones Alive
-Absolutely! Old bones are dead,
dry and brittle. But in the body,
bones are very much alive.
They have their own nerves and blood vessels, and they do
various jobs, such as storing minerals like calcium. Bones are made of a mix of hard stuff
that gives them strength and tons of living cells which help them grow and repair themselves.
We thank you for staying awake during this long presentation! And remember, the skeletal system is a very important part of your body! And again, thank you!
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