The Skeletal System Every movement is possible because of the muscles working with the bones – skeletal system. Functions of the Skeletal System: 1. Anchor.
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The Skeletal SystemEvery movement is possible because of the muscles working with the bones skeletal system.
Functions of the Skeletal System:1. Anchor for bodys movement2. Provides support3. Protects soft organs inside the body.
Classification of BonesLong bones arms and legsShort bones feet and handsIrregular bones spine
Flat bones ribs and skull
What are Bones Made Of???Bones are made of soft and hard material
Are living tissue
They have spaces inside allow blood and nutrients to pass through
Two Types of Bone TissueCompact Bone Outside of the boneSupportive tissue of the bodyIs the part we call the skeleton
Spongy Bone Tissue inside the boneStrong, but lightweight
Marrow and Blood CellsMarrow inside the spongy bone tissue, produces blood cells
The blood brings nutrients to the bone cells and carries waste materials away.
Two Main Divisions in the SkeletonAxial Skeleton Central part of the Skeleton Forms the axisProvides support and protectionIncludes the skull, spinal column, ribs
Appendicular Skeleton attached to the axis skeleton.Allows movementShoulder, legs, arms, knees, etc.
The Skeleton Changes as We Grow
Infancy Skull is made up of several bones that have spaces between them The spaces gradually grow together.
Childhood Bone growth occurs at growth plates, a flexible, firm connective tissue. The length and shape of bones is determined by growth plates.
Adolescence Bones stop growing at the end of adolescence the growth plate becomes hard, then arms and legs stop growing and the skull plates fuse together.
Adulthood As people age, more bone is broken down than is formed. Bones become less dense and can break more easily.
Joints Connect Parts of the Skeletal SystemJoint A place at which two parts of the skeletal system meet.
Three Types of Joints:Immoveable locks bones together like puzzle pieces. Ex: bones of skullSlightly moveable enables you to flex slightly. Ex: ribs connected to sternumFreely Moveable joints that allow your body to bend and to move. Ligaments hold the bones together at moveable joints.
Ligaments & TendonsA ligament is a strong, flexible band.A ligament links or connects bones together.A tendon is a cord made of tough, white tissue that attaches muscles to bones.A tendon connects muscles to bones.