Name: _______________ The Skeletal System
Date: _______________ By Seamus & Nithin
Key Concept: The skeleton supports the body, protects internal organs, provides a site for blood cell information.
Bones provide a system of levers on which muscles act to produce _______________.
Bones are the sites of blood cell _______________; Blood cells are produced in the soft marrow tissue that fills the internal cavities in some bones.
There are 206 bones in the human body, which those are divided into 2 parts, the _______________ and the _______________.
The axial skeleton supports the _______________ axis of the body.
It consists of the skull, the vertebral column, and the rib cage.
The Appendicular skeleton consists of the bones from the _______________to the _______________, along with the pelvis and shoulder area.
The Structure of Bones:
Key Concept: Bones are a solid network of living cells and protein fibers that are surrounded by deposits of calcium salts.
Bone is surrounded by a tough layer of connective tissue called the _______________.
Blood vessels that pass through the periosteum carry oxygen and nutrients to the bone.
Beneath the periosteum is a thick layer of _______________ bone.
Osteocytes - Mature bone cells.
Osteoclasts and Osteoblasts line the _______________ canals and the surfaces of compact and spongy bone.
Osteoclasts - Break down bone.
Osteoblasts - Produce bone.
Osteoclasts and Osteoblasts are what _______________ remodel our bones even after we stop _______________.
Within bones are cavities that contain a soft tissue called bone marrow.
Two types of bone marrow:
Red bone marrow - produces red blood cells, some kinds of white blood cells, and cell fragments called _______________.
Yellow bone marrow - made up primarily of _______________ cells.
Although compact bone is dense, it is far from being solid.