The Musculoskeletal System Flashcards
What are the functions of the musculoskeletal system?
- support
- protection of vital organs
- movement (limbs, chewing, breathing)
- production of red blood cells in bone marrow
-calcium reserve
How does the musculoskeletal system support the body?
Maintaining body shape and suspending organs.
What type of tissue is bone?
Solid connective tissue.
Name the two types of bone.
Cortical and cancellous bone.
Describe cortical bone.
Compact/woven bone. Solid bone forming the outside of bone.
Describe cancellous bone.
Spongy bone. A meshwork of bone that forms the inside.
What are osteocytes, osteoblasts, and osteoclasts?
Cells within the bone.
What is an osteocyte?
A cell.
What is an osteoblast?
An active cell (builder).
What is an osteoclast?
Destroyer (resorb old bone).
When are osteoclasts most active?
During growth.
How do osteoblasts work?
When blood calcium levels are high, they create new bone to store excess calcium.
How do osteoclasts work?
When blood calcium levels are low, they break down areas of bone to release calcium into the blood circulation.
What role do bone cells take in the event of a fracture?
Osteoclasts will destroy damaged bone and osteoblasts will produce new bone.
What are the types of bone?
- long bones
- short bones
- flat
- sesamoid
- irregular
What are sesamoid bones?
Small pebble-shaped bones that form in tendons.
Explain parts of a long bone.
- Diaphysis – main shaft
- Epiphysis – prominences forming
the ends - Physis - also called the growth
plate - Metaphysis – area adjacent to the
physis - Medullary cavity – central cavity
filled with bone marrow
Name two types of bone development.
- intramembranous ossification
- endochondral ossification
Where does intramembranous ossification occur?
In flat bones.
Explain intramembranous ossification.
The outline of the bone is formed by membranes, bony tissue forms
between the membranes
A – The outline of the bone is formed by
membranes with stem cell inside
B – Stem cells become osteoblasts and
start producing bone matrix
C – Eventually, the entire area becomes
bone and the trapped osteoblasts become
osteocytes
Where does endochondral ossification occur?
All other bones that aren’t flat bones.