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HEALTHY BONE REMODELING (Sam Houston State University)

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ACTIVITY 3D: HEALTHY BONE REMODELING –
THE OSTEO BLASTER/CLASTER WHEEL TEACHER PAGE
HEALTHY BONE REMODELING
Healthy bone remodeling occurs at many simultaneous sites throughout the body where bone is
experiencing growth, mechanical stress, microfractures, or breaks. About 20% of all bone tissue is
replaced annually by the remodeling process. There are five phases in the bone remodeling process:
ACTIVATION, RESORPTION, REVERSAL, FORMATION, and QUIESCENCE. The total
process takes about 4 to 8 months, and occurs continually throughout our lives.
Provide each student with their own copy of The Osteo Blaster/Claster Wheel. The numbers on
the wheel match those of the chart below, as well as, the questions on The Osteo Blaster/Claster
Worksheet. This page forms the base for the “wheel.” The cover for the wheel needs to be carefully
cut out along the dark lines. Line up the center of the cover with the base and secure it with a brad.
After the students have constructed their “wheels,” have them place their wheels with the “window”
open on section one.
The information on the chart below describes some of the events that occur during normal bone
remodeling, maintenance, and repair. Use this information to describe to the students the events that
they see on their wheel. Have the students place their “window” on number one, then they should
listen as you describe the events depicted in section one. Have students then turn their wheels to
section two, you describe the events, and so move through all eleven windows. After the information
for all eleven sections are discussed, hand out The Osteo Blaster/Claster Worksheet. Have students
complete the statements on the worksheet as they refer back to their “wheels.” Use their responses to
evaluate their understanding of bone remodeling events.
Normal Bone Remodeling-Normal Maintenance and Repair “Ordered Coupling”
Osteoblasts and Osteoclasts, “blast/clast,” activity is in balance
- PHASE -
- PHASE EVENTS –
ACTIVATION
1. Pre-osteoclasts are attracted to the remodeling sites.
2. Pre-osteoclasts fuse to form multinucleated osteoclasts.
RESPORPTION
3. Osteoclasts dig out a cavity, called a resorption pit, in spongy bone or
burrow a tunnel in compact bone.
4. Calcium can be released into the blood for use in various body functions.
5. Osteoclasts disappear.
REVERSAL
6. Mesenchymal stem cells, pre-cursors to osteoblasts, appear along the
burrow or pit where they…
7. proliferate (increase in numbers) and differentiate (change) into pre-
osteoblasts, then …
FORMATION
8. mature into osteoblasts at the surface of the burrow or pit and ...
9. release osteoid at the site, forming a new soft nonmineralized matrix.
10. The new matrix is mineralized with calcium and phosphorous.
QUIESCENCE
11. Site, with resting lining cells, remains dormant until the next cycle.
LESSON 3, ACTIVITY 3D
PAGE 12-1
Teacher Enrichment Initiatives - Positively Aging® /M. O. R. E. Barshop Institute for Longevity & Aging Studies
©
200
6
The University of Texas Health Science Center at San Antonio
Department of Medicine
-
GCRC
ACTIVITY 3D: HEALTHY BONE REMODELING
THE OSTEO BLASTER/CLASTER WHEEL
STUDENT HANDOUT
Carefully cut out the cover for the Osteo
Blaster/Claster Wheel that is provided below.
Push a two-prong brad through the dot in the
center of the cover and then attach the cover
to the base page. The “wheel” you have
constructed will be used to learn about the
events that occur during normal bone
remodeling, maintenance, and repair. Set the
“window” over section one and prepare for
the activity that follows.
© 2001 UTHSCSA "Positively Aging®" a trade mark of the University of Texas Health Science Center at San Antonio
12-1
© 2006 UTHSCSA "Positively Aging®" a trade mark of the University of Texas Health Science Center at San Antonio
12-2
12-1
UNIT
12
© 2001 UTHSCSA "Positively Aging®" a trade mark of the University of Texas Health Science Center at San Antonio
ACTIVITY 3D: HEALTHY BONE REMODELING —
THE OSTEO BLASTER/CLASTER WHEEL -
STUDENT WORKSHEET
HEALTHY BONE REMODELING
After listening carefully to the description of healthy bone remodeling, complete the
following statements as you review the events depicted in The Osteo Blaster/Claster
Wheel that you have constructed. Refer to the key for help with terms.
1.During the Activation Phase, the ____________________ are attracted to the
remodeling sites.
2.The pre-osteoclasts become fused and form ____________________ osteoclasts.
3.During the Resorption Phase, the osteoclasts dig out a cavity called a
____________________ pit.
4.As the pit is being dug out, an important mineral, ____________________, is
absorbed into the blood for use by the body.
5.After the pit is completed, the ____________________ disappear.
6.In the Reversal Phase, ____________________ cells appear along the burrow or pit.
7.The cells along the pit prepare the surface for new bone ____________________.
8.During the Formation Phase, the osteoblasts are ____________________ to the
surface of the pit or burrow.
9.The osteoblasts busy themselves with replacing the removed bone tissue with a new
soft matrix, or ____________________.
10.This phase must be called the ____________________ Phase because the new matrix
becomes mineralized with calcium and phosphorus thus creating new bone.
11.The remodeling site (now new bone tissue) remains ____________________until the
next bone remodeling cycle begins.
Now, use your wheel to try to teach someone else about normal bone remodeling and the balance
between the work of the osteoclasts and osteoblasts in bone tissue.
During the Resorption Phase, the osteoclasts burrow out a tunnel, or dig out a cavity
called a ___________________ pit.
As the pit is being dug out, an important mineral, ___________________, can be released
into the blood for use by the body.
The cells along the pit proliferate (meaning they _____________ in number) and
differentiate (meaning they ____________) into pre-osteoblasts.
During the Formation Phase, the pre-osteoblasts mature into __________________ at the
surface of the burrow or pit.
The osteoblasts busy themselves by releasing ______________, a soft, nonmineralized
bone matrix.
12-1
UNIT
12
© 2001 UTHSCSA "Positively Aging®" a trade mark of the University of Texas Health Science Center at San Antonio
ACTIVITY 3D: HEALTHY BONE REMODELING —
TEACHER ANSWER KEY–HEALTHY BONE REMODELING
1.pre-osteoclasts
2.multinucleated
3.resorption
4.calcium
5.osteoclasts
6.mononuclear
7.formation
8.attracted
9.osteoid
10.formation
11.dormant
mesenchymal stem cells
increase, change
osteoblasts
12-1
UNIT
12
© 2001 UTHSCSA "Positively Aging®" a trade mark of the University of Texas Health Science Center at San Antonio
ACTIVITY 3D: HEALTHY BONE REMODELING
Normal bone is always undergoing remodeling. This remodeling removes old
bone tissue and replaces it with new bone tissue. The remodeling cycle, removing and
building tissue, continues throughout life and is typically “in balance” to maintain
healthy bone.
This remodeling cycle involves bone “resorption” by the osteoclasts. The osteoclasts
remove the old stressed or worn-out mineralized bone. This recreates a “resorption pit.”
The “resorption” process causes osteoblasts to become attracted to the “resorption
pit.” Osteoblasts rebuild new bone tissue by laying down an unmineralized matrix,
called osteoid, which will eventually form new mineralized bone.
When this rebuilding is complete, the area of bone remodeling rests until the next
remodeling cycle begins.
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Completed 15 May 2022

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