1. How does the skeleton support the body? What is the function of a ligament?
Supports the body both inside and outside. Ligaments hold bones together.
2. What are examples of how the bones of the skeleton protect vital organs?
Protects organs like the brain, spinal cord, and the heart.
3. How does the skeleton provide movement? What is the function of a tendon?
Provides movement. As muscles move bones, the body moves too. Muscles are attached to bones by tendons.
4. What minerals are stored by bones?
Bones store minerals (calcium, phosphorus, magnesium) and additional nutrients.
5. What blood cells are produced by red bone marrow?
Blood cells (RBC, WBC, and Platelets) are produced in red bone marrow.
8. Compare the functions of chondroblasts and chondrocytes?
Chondroblasts (cartilage matrix-producers).
Chondrocytes (cartilage-maintenance cells).
9. What is a perichondrium?
The Perichondrium is a thin covering over the main body of the cartilage.
12. Know examples of long bones, short bones, flat bones, and irregular bones
Long bones include the femur, the humerus, the tibia and several other bones.
Short bones are carpals and tarsals.
Flat bones include bones like the sternum and
Irregular bones are vertebrae.
13. What is the difference between a bone diaphysis and a bone epiphysis?
The Diaphysis is the middle section of a bone.
• The Epiphysis refers to the ends of a bone.
14. What is the difference between an epiphyseal plate and an epiphyseal line?
The Epiphyseal plate contains cartilage used for producing bone.
• The Epiphyseal line is formed after the epiphyseal plate has stopped producing bone).
15. Where is the medullary cavity and what is contained in it?
The Medullary cavity is the cavity inside the diaphysis that contains yellow marrow.
16. Where is the periosteum and what does it contain?
The Periosteum is the covering of a bone. It contains nerves and blood vessels.
17. What are Sharpey's fibers?
Sharpey's fibers attach the periosteum to the bone as well as serving as attachments for ligaments and tendons.
20. What is the function of an osteoblast? Osteocyte? Osteoclast?
Osteoblast - Bone building
Osteocyte - Bone maintance
Osteoclast - Bone destroying (Breakdown releases Calcium)
21. What are osteochondral progenitor cells?
Osteochondral Progenitor cells are stem cells that can be used to form more bone cells if needed.
22. How is woven bone related to lamellar or cancellous bone?
Woven bone is a form of bone that changes into either lamellar bone or cancellous bone. (Dense bone forms)
23. What mineral gives bone its strength for weight bearing?
(Calcium and Phosphorus mineral) gives a bone strength.
25. What is the proportion of collagen protein to mineral matter in a bone?
A bone is normally 1/3 collagen and 2/3 hydroxyapatite.
32. Under what conditions would the trabeculae change orientation?
stress lines change if a person gains weight or has a bone injury
The Lamellae? (Function)
layers of bone that form around the haversian canal giving the bone strength
Circumferential lamellae? (Location)
are found around the outer edge of the compact bone beneath the periostium
36. Bone is formed from what three kinds of tissues?
regular and irregular collagenous tissue, and hyaline cartilage
38. What bones are formed during intramembranous ossification?
the bones of the cranium, the roof of the skull, part of the manible, and the clavical
40. What is the first event in intramembranous ossification?
osteoblasts forming bone within a membrane
Intramembranous bones are formed from what two kinds of tissues?
dense irregular and regular collagenous tissue
Where does ossification begin?
starts in the middle of the membrane and bone forms outward from there
Where is the oldest bone and the youngest bone in a bone fragment? ***
oldest is in the center, youngest is on the outside ****
43. What are fontanelles? How do they form? When do they close?
membrane covered spaces between skull bones, they form because the bone develops from the center outward, they close by age 2
44. Fontanelles allow for two events to occur. What are they?
continued growth of the brain for a short time after birth, pelvic vaginal birth
45. What is "head molding" in an infant?
as the head comes out it forms to the birth canal for easier passage
48. How does ossification proceed from the primary ossification center?
bone development proceeds toward the epiphyses
What is the last event of endochondral ossification?
two secondary ossification centers form in the epiphyses
49. What is the relationship of the location of the epiphyseal plate and the primary and secondary ossification centers?
it is a layer of cartilage between the two
50. What kind of growth occurs from the epiphyseal plate? How long does this growth persist?
bone length occurs, through the teen years for most individuals
51. What are the 5 major events of endochondral ossification?
1. forming cartilage model 2. forming the bone collar 3. bone development toward epiphysis 4. 2nd ossification centers 5. forming of the epiphyseal plate
53. What role does estrogen play in female growth in height?
responsible for growth spurt and closing of epiphyseal plate
54. What is the difference between an epiphyseal plate and an epiphyseal line?
the plate becomes the line after the plate becomes nonfunctional
56. Name the 4 epiphyseal plate zones.
resting cartilage, the proliferation zone, hypertrophy zone, calcification zone
60. Describe the 6 growth events that occur at the epiphyseal plate.
1. cellular proliferation (division), 2. cellular hypertrophy (enlargement) 3. calcification of cells (mineral deposition) 4. cellular death (cartilage is replaced by bone) 5. ossification 6. remodeling
61. Why does a person stop growing in height?
bone growth in length stops when the epiphyseal plate is completely replaced by bone
62. At what age does the growth spurt occur in girls? Boys?
Between 8 and 13 years in Girls and between 10 and15 in boys
63. Describe the events that lead to a bone growing in width.
1. osteoblasts in the periosteum form ridges that gradually grow together 2. each ridge develops concentric rings by the addition of matrix (bone becomes wider) 3. the increases in diameter are accompanied by increases in the diameter of the medullary canal (bone walls become thinner)
66. How are vitamins A, C, and D needed for bone growth?
A - osteoblast and osteoclast activity, D - calcium transfer, C - collagen formation
67. What different hormones are needed for effective bone growth?
sex hormones and the thyroid and parthyroid hormones and growth hormone
68. What three stressors may cause bone remodeling?
weight and activity changes as well as disease/injury processes
71. What occurs in osteoporosis?
It's a loss of bone mass due to the lack of calcium or the means to replace that calcium into the bone.
72. What are the 4 steps in bone repair?
1. hematoma (blood clot) formation, 2. callus (soft clot) formation 3. callus ossification occurs to harden the tissues formed around the broken ends of the bone 4. remodeling of bone occurs to compensate for the body's response to the break in the bone
74. What occurs if calcium in the blood is high?
It goes into the bone as osteoblasts to build new bone
75. What is the function of parathormone?
increase osteoclast activity and increases the break-down of bone so more calcium is carried in the blood