Skeletal System
How much of our skeleton is replaced each year?
10%
Individual cells within the lamellae are called
Osteocytes
Your friend tells you that he is going to the doctor to have a Pott's fracture treated. Next time you see him, you will see a cast ________
around his ankle
_______________ bones are the thinner ones
Flat bones(sternum)
Bones allow you to store
Phosphate, Calcium, and minerals
What would your suggestion be to keep astronauts skeletons healthy in space?
Prepare them well before they leave and take care of them extensively when they arrive
The basic structural units of bone are called: _______________
Osteons
What is the name of the canal that connects osteons to other osteons?
Perforating
What is the outer layer of bone called?
Periosteum
What is the process called when bones replace old, worn out bone tissue, with new, healthy tissue?
Remodeling
What is the "secret ingredient" to how strong our bones are?
The structure of trabecular bone
What type of bone marrow produces blood cells?
Red
The __________________ skeleton (pretty much everything else) contains the bones that help us move around
Appendicular
The _________ skeleton includes 80 bones divided into the skull, vertebral column, and thoracic cage regions
Axial
The flared ends of a long bone are called: _______________
Epiphyses
The average human body contains ______ bones
206
Every ____ to ____ years you get a new skeleton
7, 10
While observing bone tissue, you notice that osteoblast activity exceeds osteoclast activity. Which of the following events are you observing?
Bone growth
The osteocytes are connected by tiny channels called
Canaliculi
In the embryonic stage your bone starts off as _________________
Cartilage
__________________ house your osteocytes
Lacunae
What are the rings formed by the osteocytes called?
Lamella
Why is it important we have both types of bone, and not just one or the other?
To make our bones strong, light, flexible, and efficient
What is the "honeycomb" like bone on the inside called?
Trabecular bone
Bones maintain homeostasis by regulating blood calcium levels.
True
Which of the following is essential for normal bone growth?
Vitamin D3, Sex hormones, Calcium
What are four things you can do to help prevent osteoporosis and maintain bone health? Why are these things helpful?
Walking, jogging, dancing, and weight training They're helpful because they stimulate remodeling and promote bone growth
Hematopoiesis
blood cell production
The central shaft of a long bone is called the ________.
diaphysis
Which of the following matches the cell with its function?
osteoblasts: ossification
_____________________ stimulate bone remodeling and ultimately bone strength
Exercise
Bones are dead tissue
False
What is in the center of each osteon?
Haversian canal
Which of the following is NOT a function of the skeletal system?
It is the main source of body heat.
Intramembranous ossification results in the formation of which of the following bones?
Mandible
Where are trabeculae located?
On the spongy bone
Your bone makers are your _________________________
Osteoblasts
Your bone breakers are your _________________________
Osteoclasts
What is the main difference between spongy bone and compact bone?
Compact bones contain osteons; spongy bones contain trabeculae.
_______________________ are mature bone cells that monitor and maintain your bone matrix
Osteocytes
What are the three areas most at risk for an osteoporotic fracture?
Spine, thighbone, and wrist
Which of the following is NOT a function of the skeletal system?
temperature maintenance
The _______________ in an osteon hold nerves and blood vessels
Central canal
What are the two type of bone tissue that are found in bones?
Compact and spongy
Who copied the structure of this bone to build the tallest building in the world (at one time)?
Gustave Eiffel in 1889
What is the hard shell on the outside of the bone called?
Cortical bone
_______________ bones are cube-shaped. As long as they are wide
Short bones (talus)
Which of the following bone shapes and examples are mismatched?
Short bones; vertebrae
______________________ bones are all the weirdly shaped bones
Irregular bones(vertebrae)
Compact bone is made of multiple osteons which are composed of concentric circles called
Lamellae
_______________ bones are the classic "dog like" looking bones. Longer than they are wide
Long bones (tibia and fibula)
What contains the yellow marrow in a long bone?
Medullary cavity
The shaft of a long bone is called what?
diaphysis
Blood is generated in your _____
bone marrow
What type of bone marrow stores energy as fat?
Yellow
The majority of the weight of the bone is due to ________.
calcium salts
Which of the following is responsible for the production of new bone?
osteoblasts
The cross section of an osteon looks like the rings of a __________________
tree trunk
The shaft of a long bone is called: _______________________
Diaphysis
Where are fractures most likely to appear?
Where there is trabecular bone