SKELETAL SYSTEM Flashcards
5 Functions of the Skeletal System
Movement
Support
Protection
Makes Blood
Storage
Bones store minerals, such as calcium and phosphorus, for use by the body
Storage
helps build dense boneS
Calcium
Skeletal system provides points of attachment for muscles.
Movement
Your legs and arms move when the muscles pull on the bones.
Movement
The backbone is the main support center for the upper body
Support
It holds your head up and protects your spinal cord
Support
The bones of your skull protect your brain
Protection
Your ribs protect your lungs and heart from injury.
Protection
Red and white blood cells are formed by tissue called marrow, which is in the center of the bone
Makes Blood
Two Major Skeletal System Parts
Axial Skeleton
Appendicular Skeleton
includes the appendages of the body, which are the shoulders, arms, hips, and legs
Appendicular Skeleton
includes the skull, spine, ribs and sternum.
Axial Skeleton
Four basic bone shapes
Long, Short, Flat, Irregular
spine
Irregular
skull and sternum
Flat
wrist and ankles
Short
arms, legs and fingers
Long
Longer than they are wid
Long Bones
All limb bones except the patella (kneecap) and the bones of the wrist and ankle
Long Bones
Roughly cube shaped
Short Bones
Bones of the wrist and the ankle
Short Bones
Thin, flattened, and usually a bit curved.
Flat Bones
Scapula (shoulder blade), sternum (breast bone), ribs, and most bones of the skull
Flat Bones
Have weird shapes that fit none of the 3 previous classes.
Irregular Bones
Vertebrae, hip bones, 2 skull bones – mandible and maxilla.
Irregular Bones
Bone Classification
Irregular Bones, Flat Bones, Short Bones, Long Bones
All bones consist of a dense, solid outer layer known as
compact bone
inner layer
spongy bone.
Typical Four Layer
Periosteum, Compact Bone, Spongy Bone, Bone Marrow
Fills the gaps between the spongy bone
Bone Marrow
Lies beneath the compact bone
Spongy Bone
Lies beneath the periosteum
Compact Bone
Covers Bones
Periosteum
complex living structures that undergo growth and development.
Bones
Beneath the outer membrane is a layer of
compact bone
hard and dense, but not solid – it is filled with holes and has small canals for blood vessels and nerves
compact bone
are arranged in rings around Central Canals, passageways for blood vessels and nerves.
compact bone, osteocytes (bone cells)
type of connective tissue, so it must consist of cells plus an extracellular matrix
Bone tissue