Chapter 7 - Bone Structure and Function Flashcards
What are the 4 functions of the skeletal system?
1) provide support and protection
2) assist body in movements
3) participate in blood cell production
4) storage of mineral and energy reserves
what are the 3 main components of a long bone?
1) Diaphysis - shaft
2) Epiphyses - forms the distal and proximal ends of a long bone
3) Metaphyses - area btw diaphysis and epiphyses
How do bones store minerals and energy?
fats are stores in adipose tissue of yellow bone marrow.
calcium and phosphorus are also stored in the bone.
explain how bones assist in movements
muscles pull on bones to form movements
in what ways do bones provide structure and protection for the body.
- structural framework
- point of attachment for tendons and ligaments
- protects internal organs
what are the characteristics of Compact Bone
- strongest form of bone tissue
- resists stresses from weight and movement
- located on the outside of bone
What are the characteristics of spongy bone?
- located within compact bone
- supports and protects red bone marrow
What is Articular Cartilage and where is it found?
thin layer of hyaline cartilage that covers the epiphysis of long bones. It is on articular surfaces of bone.
What type of cartilage makes up the intervertebral discs and is found in the pelvis and knees?
Fibrocartilage
A tough sheath of dense irregular CT located on the outside of the bone is called _______________.
Periosteum
A space that contains fatty yellow bone marrow in adults is called the _____________________.
Medullary Cavity
What is the Endosteum?
a membrane that lines the medullary cavity
What are the general characteristics of Red Bone Marrow?
1) Hemopoietic (forms blood cells)
2) contains reticular CT (scaffolding), immature blood cells, and fat
how does Red Bone Marrow differ btw children and adults?
children: in spongy bone and medullary cavity of long bones. Children need more because they are still growing (higher metabolism)
Adults: located in portions of axial skeleton and proximal epiphyses of humorous and femur.
_______________ is a product of Red Bone Marrow degeneration.
Yellow Bone Marrow
what the general characteristics of Yellow Bone Marrow?
1) product of Red Bone Marrow degeneration.
2) stores fat
3) can convert back to red bone marrow during severe anemia
4) in adults it is found in medullary cavity of long bones
Osteoprogenitor cells
unspecialized bone stem cells.
mature into osteoblasts and then osteocytes
osteoblasts
bone building cells
osteoclasts
cells that break down bone
do not arise from osteoprogenitor cells
osteocytes
mature osteoblasts
what is the chemical composition of bone?
15% water
30% collagen fibers
55% mineral salts: Calcium phosphate, calcium carbonate, trace elements (magnesium, fluoride, sulfate)